If you want a SMIC for a great deal, PM CustomMSP and he'll hook you up. He has either tube and fin or bar and plate SMICs for $465 shipped that was as good as any, and work well with turbohoses and spool hardpipes.
If you want an easy install, and don't plan on doing major work to your car, a SMIC is a reasonable mod to go. Dyno charts have shown a 20hp increase with a SMIC alone at 10psi. I'm sure numbers are the same for a FMIC at the same psi, but this is cheaper without hardpipes than a FMIC and a way easier and faster install.
If anything, you should upgrade the IC since the stock one isn't the greatest, and you'll get some really good gains from doing that.