08 sti has dual avcs, bigger tmic, bigger turbo, 18inch wheel, 245 tyre, more efficient stock air box and si drive (multi map). Most g3 sti can get 280whp just with
tbe, 300 with cai, boost solinoid and 22psi. If u push more than 300whp, con rods will be a issue, but again 07 sti is probably good for 320ish(at that time u will need headers, turbo and top mount for about $4k), then u will be looking for rebuild engine at that stage anyway. but it is more reliable if u like to thresh from cold or hit red line all the time.
My advice get g3 sti, do a compression test before handing over ur hard owned cash. If everything is good, buy it, install aos, change all fluids, ie redline engine oil/power steering fluid, motul gear 300/rbf 600. Maybe get oil pressure gauge and boost gauge, thresh the car after oil is warm, as water temp is not oil temp.
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