I would save the money for a G100 that comes out in the summer.
this is always wrong
if you wait for the 100 then wait for 110 then 120
never wait! always upgrade as you go along
you can ebay you card for $200 plus and then buy a new one for $300 or so
30-40% performance boost for $100 - its worth it for one game if you play it all month!