Hi, I have a EVGA Geforce 9800GTX+ sitting at home right now for my new desktop. I can get a HD4850 (the Sonic oc'ed version by Palit) for exactly the same price ($180cnd). Should I return the 9800 and get the 4850 instead? 4850 here in Canada is a lot more expensive for some reason so that is the only 4850 I can afford.