OK, thanks guys...i'm glad i did end up getting the stranded. The guy at Radio Shack was telling me that for conductivity and stuff i'd be better off with solid, but i remembered my Ms Pac has stranded wire in it, so i went with that. Plus, it is easier to bend stranded wire to fit in my IPAC.
I ended up getting stranded, 22-gauge for the wiring and 18 gauge for the grounding wire. Hopefully that will work! Thanks again guys.