I am planning on replacing the stock radiator.

Which brands would you recommend?  There are a huge range of brands and prices from generic, no name for $65; to NISSENS for about $145.

Thanks for your input

I got a full aluminum one, about 135.  I did post it here a couple of years ago.  I forget the brand right now but it was reasonable and great quality.

i've never had a problem with the cheap ones for $80 and $90 but for $135 an all aluminum sounds fantastic.

The more expensive ones I found are copper with plastic surround; as opposed to Aluminum with plastic.

 

Not found any with AL surround...

I bought one from kragen orielys for about 100 bucks and they last around a year before springing a leak, so ive used the warranty a couple times, the latest one i got from them the atf, cooler connectors came out to far and i had to bend them to get the rad to sit in place, the metal connectors were hitting the frame rail, not really impressed.

I got mine from this company: KOspeed:

 

http://www.ebay.com/itm/02-07-SUBARU-IMPREZA-WRX-STI-MANUAL-MT-DUAL-CORE-2-ROW-ALUMINUM-RACING-RADIATOR-/171190336532?pt=Motors_Car_Truck_Parts_Accessories&hash=item27dbbd3c14&vxp=mtr