very well said!
oh wait... you have a KRONOS? D: you bastard

hahaha joke joke!
well that's all truth, it depends on your budget, it depends on what you really want! but it's heavily suggested that you search for an editable stuff (in case you want to do jens's lead sound, (which i FINALLY DID over 3 months of focusing)
JV1080 is recommended, but it would take time and patience to learn to program it, so i would recommend a 1-piece gear! and if you go there, PLEASE make sure your controller is not Korg, or you will have HARD TIME programming it (own experience),it's far better for you an M-audio's Axiom 61(i own like 3, 2 in painting process, and 1 original, the one i used for Children of Bodom gig)
Korg: please NEVER even think of going for the X50, NEVER; you can get better with Tritons, even TRINITY, M3, but some awesome Korg would be the Triton Extreme, heavily recommended, plus it's SEXY as hell, and very complete.
Roland: as Plisken said, there are tons of choices, and they're all good choices, Fantoms, Junos, whatever, there's a lot of options! and if you have tons of money you can buy their new Jupiter, which costs a shitload of money!
personally i'm aiming for Roland's V-synth, i'm in LOVE with it.