Mine would be dominated by Masterpieces. Not in order as such.

MP Tracks
MP Sideswipe
MP Sunstreaker
MP Dirge
MP Bluestreak
MP Buzzsaw (yes, that's right, he's the cassette I like the most)
POTP Beachcomber
Combiner Wars Brawl (yes, I know that wouldn't make most people's lists & I don't care...)
Combiner Wars Air Raid

...and of course Generations Dirge.