my intercooler was off ebay for £85, powereing my 300+bhp 2.0litre turbo starlet...
It will be fine mate, an intercooler is an intercooler, some may have a better flowing core, give more sufficient cooling etc but at the end of the day there aren't HUGE advantages in spending £800 for a HKS one whatsoever.... wouldn't waste my time or money....
Hope that helps