You're kidding right? An RB25 will put about 175-180hp to the ground stock. Mine has turbo back HKS exhaust, K&N panel filter, FMIC and 10PSI on the stock turbo and has been Dyno'd at 227.2 RWHP. A SAFC and a little tuning would push this up round 250 easy as it has stock ECU and runs as rich as a Packer over 5000rpm.All up it's cost me about $2K for the mods and I am currently saving for a PowerFC because I'm not all that happy with the band-aid SAFC approach.
Use your head pal, listen to people who know more than you... or don't, it's your money you will be pissing away.