The one other option you have is a lightweight / under drive crank pulley. You can pick up a pulley for about $125-$150, but the install is a PITA. Up until now I have done all my own work, but I'm considering having a reputable shop install it. They want $500 to do it. Again, this isn't exactly cheap and it will only add around 5whp, although throttle response is also improved.
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~Rob 
-DD Air Guide, Stillen G3 CAIs, 63mm Throttle Bodies, Motordyne M370, Berk HFCs, FI TDX CBE (non-res, CF), Sprint booster v3, Ecutek Dyno Tuned, and the list goes on...
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