If i have to choose betwen xpert vision 8600GT GDDR2 512MB,MSI 8600GT GDDR3 512MB and Sapphire Hd 3850 256MB for my computer which have 19" LCD.Which will be the best choice?The problem is that "xpert vision 8600GT DDR2 512MB" cost about $83,"MSI 8600GT DDR3 512MB" about $131 and a SECOND HAND "Sapphire Hd 3850" about $125.I really don't wanna buy the second hand "Sapphire Hd 3850" as it may have some problem and the price is suspicious as well.But i will consider if its superior than others.Also is GDDR3 worth extra $40 dollars?Will i be able to play games like crysis in medium setting with 8600GT DDR2 512MB?