which is better

[mission68]

hi i have the BFG GeForce 8800 GTS OC 320MB GDDR3 HDTV/Dual DVI (PCI-Express) but i have seen the BFG GeForce 8800 GT OC 512MB GDDR3 HDTV/Dual DVI (PCI-Express) on overclockers for around the same price i am getting 1 of these for my sons new pc but was thinking if its better then the 1 i have, i would put it in my pc and give him mine

 

[mission68]

so is a big difference and worth my while swaping it or is there anything else out there for the 200 mark

 

[mission68]

so will the new gts be far faster then the gt and much faster then the BFG GeForce 8800 GTS OC 320MB GDDR3 that i already have am confused now