^ +1 I have about the same in my turbo setup, and I bought MOST of the parts off EBAY BTW (not retail or it would have been MUCH more)....so yea turbo or S/C shouldnt be considered. You COULD peice togethor a cheap turbo kit...I think Ricky Bobby has done this for a few people.
But the problem is all of the parts you will want to get for safety and reliability. Gauges, clutch, fuel system, dyno tune, ect. No matter what, your going to spend some serious cash with the S/C or turbo setup.
BIG +1 on the N20....ONLY go with the NX kit with the safety upgrades though. Its the best out there from what I have seen. Just do some searching, and you will find ALL the info you need on this site.