I don't know my top 10 but 3 I enjoyed would be:

Generations Blitzwing (despite the flaws)
Animated Shockwave (superb idea and execution)
ROTF Longhaul (compact truck into beastly bot)

3 I didn't enjoy would be:

Cybertron Seekermold (looks good but stumpy arms)
PRID Megatron (They didn't ever really nail Megatron above dlx size)
DOTM Megatron (mold was fine but I felt they didn't get the bulk right)

 

GDO Powerdive, DOTM HA Soundwave (not a Voyager, but same robot size), HFTD Lugnut, ROTF Long Haul and Movie Incinerator are all here at university with me, due to being my favourites.

I'd also recommend GDO Megatron (or his mold-mates), and don't believe the hate surrounding Gen Blitzwing.

 

For me I'd say:

TFTM Incinerator
ROTF Long Haul (or any version of it)
ROTF Mixmaster
ROTF Bludgeon (or any version of it)
ROTF Mindwipe
ROTF Starscream
DOTM Megatron
DOTM Shockwave
Prime BH Shockwave
Generations Blitzwing (issues and all)

All of these are great! In my opinion at least lol.

 

Lots of mentions of RotF Mindwipe. I agree completely, and additionally, strongly recommend you hunt up RotF Skystalker to go with him, since their combined modes are quite fun.

 

DOTM Megatron
DOTM Shockwave

Transformers Prime Megatron (preferably one of the Takara versions)
Transformers Prime Dreadwing/Skyquake
Transformers Prime Beast Hunters Shockwave
Transformers Prime AM Breakdown

United Megatron (I prefer the silver paint over the chrome chest/dull grey of the Henkei version)
Reveal the Shield Lugnut
Generations Blitzwing

 

some of my favorites...ROTF Bludgeon, Mindwipe, Mixmaster. HFTD Lugnut. Generations Blitzwing and Double Dealer. Arms Micron Breakdown.

That's about it for me.

 

I forgot to add in HFTD Lugnut and TFP Breakdown. Both are awesome as well!

 

Good Decepticon toys are few and far between, and good Voyagers are even harder to find. After the first few there is a major drop off imo.

HFTD Lugnut
Classics Megatron
TFTM Blackout/ ROTF Grindor
ROTF Mindwipe
ROTF Long Haul
Cybertron Mudflap
Energon Shockblast
TFP Dreadwing
ROTF Bludgeon (only if you include the Headrobots kit)

 

Blitzwing
Black Optimus Prime
United Megatron

 

Galaxy Force Starscream
Cybertron Crumplezone

 

Galaxy Force Starscream has to be number 1. If you can find it, buy it. If not, try to find a Universe Dirge...same mold in Dirge's colors. For a Cybertronian tetrajet, that mold beats the pants off the Titanium versions and the FoC deluxe seekers.

 

Generations/HFTD Lugnut, Powerdive and Blitzwing

TFTM Blackout (size is lacking but he's fun, and a kickass vehicle mode)

ROTF Bludgeon and Mindwipe

Beast Hunters/SDCC Shockwave

Beast Hunters Darksteel with Renderform Deszaras upgrade kit

PRID Skyquake/Dreadwing and Botcon Megaplex

Universe Skyfall and Darkwind with Renderform upgrade kits

FOC Soundwave/Soundblaster

Cybertron Mudflap

AOE Galvatron (shellformer but not that bad)

-

 

dropshot
banzaitron tank
mindwipe
lugnut
BH Shockwave
doubledealer
dreadwing
shark megatron
clench
dreadwind
toxitron

 

Animated Shockwave
Animated Megatron
BH Shockwave
HFTD Lugnut
ROTF Mindwipe
ROTF Bludgeon
Cybertron Soundwave (I don't have him but he looks nice)

 

There was a voyager megs in animated?

 

The Cybertronian Jet version, before he came out of the floor in Sumdac tower.

 

Classics Nemesis Prime
Universe Lugnut
ROTF Tank Bludgeon (Even though his main sword is too big for his hands)
PRiD Megatron
PRiD Thundertron (Does he count? His faction Logo is a combination of both Decepticon and Autobot)
Generations Blitzwing
BH Shockwave
I can't think of anymore.

 

RTS lugnut
Ani Shockwave
HFTD Bludgeon
Ani Blackout
Gen Blitzwing

 

The Fallen is an excellent Voyager. He's a bit lanky so he comes up pretty tall.

I'm also pretty fond of AoE Galvatron (despite him being a blatant shellformer). Nice wide, solid bot mold.

Otherwise, Prime Beast Hunters Shockwave is pretty hefty for a Voyager. In both size and weight. His posability isn't great though.

 

Generations Blitzwing
Generations Doubledealer
Age of Extinction Galvatron
Revenge of the Fallen Starscream
Dark of the Moon Shockwave
Fall of Cybertron Soundblaster