don't own any myself, but the G2 set was pretty cool. Pyro and Clench are both pretty awesome, when I had little interest in the original versions of those toys. The Sharkticons are pretty nice troop-builders. Rapido is fun, although I wish he'd been Skram instead.
assembling a Neo-G1/TF:TM cast. Please PM if you have (or know of) the following at a reasonable price: Classics or Henkei Prowl, Astrotrain, Ramjet, Skywarp, Sunstreaker, Sideswipe, Blurr, Perceptor, GDO Wheelie and Springer, or 3rd Party Motobot Arcee, FP Springer, iGear Ratchet and Ironhide, City Commander (and/or Ultra Magnus), Starscream (deluxe) Coronation add-on, or Spike and Daniel in their Exo-Suits.