"The cheapest one you can find because they are all pretty much the same."
What?????? The ram on TI-200 based video cards is landing all over the map. 4ns, 3.8ns, 3.6ns, and now 3.3ns. With the cheapest generic TI-200's costing $150 plus shipping, how can ANYTHING be recommended other than the 3.3ns EVGA card that has about 6 listings on Pricewatch starting at $175?
Go get the EVGA TI-200 and your memory, rated at 600mhz, should do at the least 580mhz with upside potential to 600+mhz