Dunno if it's too late, but you can get a 5770 for twenty bucks more. i have the powercolor 5770 with the 875mHz clock and 1gb of RAM. it's been great, here's a link
for the cheaper one with the 850mHz clock. I don't know if the difference is that important between the two Powercolors as ATI let's you overclock easily with the catalyst control center. I guess if you're already pushing the budgetary limit with the 5750 then a 5770 might be too much, but if you have the 20 bucks I'd go for it.