These are just my opinions... If you make a bad choice based on shit I say that's your ass...

<--- Disclaimer...
Well... My main thing is to deal with what you got... It's just kinda time consuming but not as much as learning a new piece. Then add in the hours you spent making that money you're spending... Loosing a lot of time you could spend dropping shit and perfecting your craft.
I personally think you should try some MO PHATT sound programming before you spend another dime (if you haven't)... I know when I need a new sub bass I can tweak out a patch on my PLANETT PHATT in a matter of seconds. I'm pretty sure your PHATT got some better sounds and a few more parameters and efx and all you can work with...
Can't the MO PHATT hold a new sound rom? If you don't have it that'd be the second thing I'd do. Take those sounds and flip em up to. Sound for days on the same outputs and midi line, smaller learning curve, and no extra shit to get in your way...
Then you got the MPC... You got a zip drive and the full memory right? Shit makes things hella nice with those 2 things.
Fully expanded shit is always the best route rom what I've seen.T hat's me though... You might have some money just burning a hole through your pockets. Let ya boy hold a couple bills?
Let me know what ya think...