Easily DKC2. So much depth and replay value. Better than the first one in every way. It also has one of my favourite soundtracks of all time. DKC3 didn't improve, and wasn't as enjoyable.
Jungle Beat was really great too (on Wii), but was nowhere near as deep as the SNES games. DKCR was wonderful, and I'm sure Tropical Freeze will be even better.







