It really depends what you are arfter:
- My roommate has done dnb/hardnrg for over 10 years and owns the biggest Hard NRG label in Finland (if not even whole Scandinavia), and the labels trademark sound pretty much exclusively comes from
Access Virus C
- My good old schoolmate from back in the first grade has played piano for +23 years and nowadays plays keyboards live for Waltari and he uses Korg Triton.
- My other friend Larry plays "ruotsinlaivamusiikkia", which is pretty much 70s dancemusic in a cruiseship, uses Nord Clavia.
- The Mad Professor, mr. Devin Townsend uses Korg Triton and Roland JX
- Janne Warman from Children of Bodom uses Korg X5D with Roland JV1080
http://www.youtube.com/watch?v=hMp4bC-PN8Q
I think we see a pattern here, don't we? If you want to play metal keyboards: Korg and Roland