I'm all over the place with my collecting at the moment so this list is a bit mixed.
Hoping to get things MISB/MOSC where ever possible, just because I'm still swaying back and forwards between whether or not I'm a curator
Plus sealed is good, being that first one to play with a toy is nice...

Encore - TakaraTomy
Encore 16 - Bruticus

Universe (2008) - Hasbro
Legends
Autobot Cosmos
Autobot Wheelie
Beachcomber
Bumblebee (Classics)
Onslaught
Red Alert
Rodimus
Starscream
Warpath

Animated - Hasbro
Deluxe
Prowl
Samurai Prowl
Swindle
Waspinator

Power Core Combiners - Hasbro
Salvage w/ Bombburst
Over-Run with Stunticons
Skyburst with Aerialbots

Generations - Hasbro
Deluxe
Junkheap
Skullgrin

Leader
Ironhide
Starscream

Voyager
Megatron
Powerdive
Protectobot Hot Spot

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Generation 1 & 2
One day I'd like to rebuild the collection of G1 and 2 toys that were stolen from me, though I suspect some will be either hard to find or costly.
But no harm in trying I suppose. If it's been reissued then I don't mind that just so long as I know what version I'm getting.
Loose is fine, just so long as they are complete in all other ways.

G1
Optimus Prime (low priority as I already have the Universe 25th Anniversary one)
Grimlock
Topspin
Powerdasher - "Jet Type"/Sky Dasher
Starscream
Cyclonus
Blurr
Hot Rod
Kup
Ultra Magnus
Goldbug
Rollbar
Wide Load
Pretender Jazz
Micromaster Rescue Patrol (Seawatch, Stakeout, Fixit & Red Hot)
Micromaster Groundshaker (with ATV base)

Aerialbots -
Air Raid
Skydive
Fireflight
Slingshot
Silverbolt

Protectobots -
Streetwise
Groove
Blades
First Aid
Hot Spot

Stunticons -
Dead End
Breakdown
Wildrider
Drag Strip
Motormaster

Turbomasters -
Boss
Flash
Hurricane
Scorch
Rotorstorm (low priority as I have the Machine Wars redeco Sandstorm)

Predators -
Falcon
Skydive
Snare
Talon
Stalker
Skyquake... Yeah ok since this is prone to GPS I guess I wouldn't mind the Machine Wars Starscream instead.

G2
Turbofire/Hotrider
Rapido
Skram
Windbreaker/Zap
Deluge
Jetstorm
Deftwing
Eagle Eye/Hawk
Snipe/Afterburner
Terradive
Windrazor/Tornado
Aquablast
Drench
Hydradread
Rage

Ok, that ended up being longer then I thought, and obviously I can't afford to get it all at once, but there it is lol