if you're doing midi, the soundblaster is usable...however, the main issue is how the akai thing fits into this.....are you interested in getting wav files from the akai, like record it, or just transfer midi, or use as a midi controller? the MPC is cool, but if it isn't a necessity, you'll probably only want to be able to transfer what you have stored in it , if you are going to a pc solution...
for software , BATTERY is pretty cool for beats. though as a DXi in SONAR it's a bit buggy.
good luck!