Hi amheck!
I'm in a similar situation, or I was. For my 2nd project i've started building a candy style sitdown cab.
A cross between a vewix / astro city style cab, and I'm putting in a PS3 (for MVC3, SSF4 etc) and a small PC (for MAME).
I haven't purchased one yet but will get a USB/KMV switch , they allow you to control 2 (or more) computers with one keyboard/mouse.
OR for our needs, 2 game systems with one control panel, great!
ps. wise coice regarding the tankstick.