I think Frank is telling you he thinks you should get an Sti....

To the OP: Hahaha sorry to laugh but you wouldnt believe how often somebody comes by here or the national forum with the exact line of: "I know nothing about subarus but I want 400hp" And since nobody has said it yet, 250-300awhp and 300wtq (at 3.5k rpms) is freaking nasty, coupled with the handling you get from awd is just insane. So dont really worry about being a dyno queen quite yet. Based on what I've seen price wise 8k seems good.

More on numbers (avgs from what I've seen) Please note 02-05 WRX's had 2.0L engines where as 06+ WRX's and 04+ Sti's have 2.5L:
stock 2.0L: 185 whp 200 wtq
stg1 (no mods, ecu reflash) 2.0L: 200 whp 220 wtq
stock 2.5 WRX: 205 whp 250 wtq
stg1 (no mods, ecu reflash) 2.5L: 215 whp 275 wtq
stg2 (turboback exhaust, ecu reflash) 2.0L: 225 whp 240 wtq
stg2 (turboback exhaust, ecu reflash) 2.5L WRX: 245 whp 300 wtq

STi's:
stock: 220 whp
stg 1: 250 whp
stg 2: 290 whp

Hope this helps....