Here's my suggestions: Classics Seeker mold--Easy transformation and loads of fun just to mess with. I had a Henkei Starscream on my desk I used to fiddle with but, I sold it on ebay. Classics/Henkei Rodimus--I still have one of these that i'm constantly transforming from car to robot and back again. It doesn't get much better with this one because of the simple transformation and the memories of the 1986 movie it brings back. Animated Grimlock--I bought an extra of this one jsut to have one to play with while watching TV or on the computer etc. The easy-to-do G1-esque transformation make it a prime example of a transformer you need to get just to mess with.
Animated Leader Bulkhead. Fun to play with. Classics Bumblebee and Jetfire as well. Classics Hot Rod used to be a fun one to play with, but I tend not to touch him now in order to not mess up his Reprolabels.
ML Soundwave would be another suggestion. Kinda pricy, but he's a small size, has good character accuracy, and articulation.
I keep my Classics Deluxes on display, so my favorite toy to just fiddle with while I'm watching a movie or tv would be Energon Divebomb. I don't even know why. Energon Starscream, too.
its weird, i got downshift as it has a very solid almost g1 style bot, i thought he was pretty cool but then with time i actually grew to really dislike it, how weird is that? but that sometimes happens with TF, i never liked animated voyager megs, then started kinda liking it, got one for cheap and now i cant stop playing with it!
Well, I just got Classics Deluxe Hound two days ago, and I haven't been able to put him down since. I know I've transformed it at least a dozen times, put it into many different poses, and I still can't wait to transform it again tonight! It doesn't even sit on my shelf anymore, it's on my coffee table cause I know I'll mess with it. Even little Ravage is fun too!
Dark Scorponok, Movie Wingblade, Animated Shockwave, Crossovers Wolverine, or any toy which hangs around my computer area.
TF Universe Cyclonus, imean Holy Crap he's amazing! He's what I've been waiting for since the 86' movie. Honorable mentions: ML Soundwave Classics Jetfire TF universe Galvatron (Mine does NOT fall apart when I transform him, and I think he looks great!)
I always always fiddle with: Henkai Prime Universe Galvatron BW 10 an Optimus Primal BW 10 an Megatron Henkai Megatron Universe Prowl City Commander set with Classics Ultra Magnus attached.
Two of my favorites to fiddle with, especially Henkei Rodimus, scored one recently, and like you said, it's 1986 all over again.
Either of my Duocons: Picked both of these guys up at BotCon last April. They're the textbook definition of a true "brick," but I can fiddle with them endlessley for some reason. Movie Landmine: You can have him do a handstand AND a spining kick at the same time, he's that poseable. Plus, his alt mode kicks serious butt. Universe Acid Storm: Seeker. Nuff said. Classics Bumblebee: I got the WM exclusive variant, and I just love how poseable he is (esp. with the jetpack off, the Wave Crusher severly limits his quite substantial head movement range) G1 Sixshot: Also a BotCon find, he's more poseable than you'd think. An example being that you can turn his forearms if they're sticking out straight ahead of him. Also quite usefull is the fact he can hold any version of the Mini-con Star Saber, Armada or Energon. I have yet to try the Skyboom Shield or the Requiem Blaster as I do not own the required mini-cons to make them. Energon OP: Yes, the fat one. For all the bad rep only because he's fat, his drones as limbs offset that obesity, plus he's got a nice range of articulation. The Helicopter drone makes a great arm, as it's a fist AND an arm blade!
It's a toss-up for me between the Classics seeker mold (doesn't matter which character) or the Evac mold (Springer, Evac or Blades, again doesn't matter). I find myself picking them up and fiddling with them while I'm thinking over stuff at work.
TFA Voyager Bulkhead I wish I was younger when I got him so I'd take him anywhere without the "I COULD LOSE A PART MAN!" guilty.
Any and all of the new Legends guys! I even take 'em with me in the car. Stuff 'em in a pocket, good to go!
BWN Stampy because he's tiny and posable, and I actually like to fiddle with RiD Autobot brothers when I just need to sit down for a while. As for recent toys, TFA Prowl is my favourite.
I have all my Animated stuff right next to me on my headboard, so I'll often just nab one of them to fiddle with, usually my newer acquisitions get the most fiddle time, then I'll start going back to others. I also fiddle with Universe Ratbat a decent bit. Yeah, I've got a bad habit of taking a figure with me if I go and watch tv or a movie or something downstairs, I just like having something in my hands to mess with.
Landmine is definitely one of my choices, he's so damn articulate. These days I can't keep my hands off Treadbolt, Roadbuster, Ratbat and Henkei Megatron.