hey man, seriously as I said in the other thread Chriss is the man in regards to keyboards here and I KNOW he'll have some ideas fo' ya, TexRoadkill will come around soon too, listen to those dudes (and everybody else for that matter, some knowledgable cats round here).
Like I said I own the Triton and IMO it'll be sufficient for your purposes and I think it has a really easy learning curve. The manual isn't too too fall-asleep stuff and that touch screen really helps you get inside it, lays stuff out for you. Whatever advice you get, it's definitely down to what you want to do, what sounds your lookin for and what your gonna be recording onto. The most important thing is that you do all the reading you can, ask all the questions you need to, especially down at a place like Guitar Center, test those dealers, they will know more than you and hey it's their job. Happy Hunting!
Laj