[Prowl 2009]

Hot Rod/ Rodimus - Classics version w/ FansProject add-on Protector Armor.

Kup - Generations.

Blurr - Generations, I know it's based off his IDW appearance, but there really isn't a lot of choice in the Classic-esque Blurr department.

Arcee - For now, Animated Arcee is as close as you're going to get.

Ultra Magnus - Classics Magnus w/ City Commander add-on from FansProject.

Springer - FansProject Warbot Defender is nice, but there is also a version in Universe that came in a comic 2-pack with Ratbat that would do the job well.

Blaster - I'd say the 2008 Universe edition with the planned Transformers Club add-on kit, or the SDCC 2010 Comemerative Blaster or Device Label Blaster are your best 3 choices.

Dinobots - LOL, well you can start with MP-Grimlock.

Ironhide - Universe 2.0 Deluxe Ironhide

Perceptor - Generations

Astrotrain - Henkei Astrotrain, the coloring is proper, the Classics version is too bland.

Soundwave - Generations WFC Soundwave or MP3 Soundwave are your best and probably only choices for now.

Megatron - WFC Megatron probably if you want to keep with scale, or the newly released United Megatron, which still retains his classic G1 gun alt mode.

Galvatron - Universe 2.0 Deluxe Galvatron, but you'll either love it or hate it.

Scourge - Generations.

Cyclonus - Universe 2.0 Deluxe Cyclonus

Starscream - Universe 2.0 Deluxe Starscream

Rumble Frenzy - If you want them now, Perfect Effect has some nice versions available, but Hasbro has versions of their own planned to be released in the RTS line this year.

Shockwave - Alternators Shockblast is pretty good, G1 Shockwave has his original alt mode, or maybe you could wait for DOTM Voyager Shockwave if you wanted too.

Devastator - In the Classics line, the Constructicons were released in gift sets, so there is that option, or a G1 Devy with the CrazyDevy upgrades or, if you wait, Transformers Club is releasing a Devy of their own.

Wheelie - Universe Legends Wheelie.

Hope this helps a bit.