Seriously...
I f you want to use a hardware interface to deliver your sound then get as much as you can for as little as you can. Get to know the process of delivering your own expression through several sources. You need many sources. I mean you are looking at a way to deliver music other than vinyl or CD.

So...

Will a machine do this for you in the way you want it to?
Am I right in assuming that you would like to deliver loops and samples in an arranged fashion reflective of your personality. Right now in this moment....??
If that is what you want to do then you need as many sources of sound as possible. You need to be able to create "that" sound right now thats in your head. What will allow you this possibility?? What of the many sources are you going to use in order to capture that picture in your mind...??

So many questions...
But only one answer.......your answer.

.../sorry if this is sh_ite :)