Honestly if your budget is that strict pick up a 5770 you can get an OC'd version on sale for about $100
This one is the PCS+ version so it is better than a stock reference card.
NCIX.com - Buy Powercolor Radeon HD 5770 PCS+ 875MHZ 1GB 4.9GHZ GDDR5 2XDVI HDMI DP DIRECTX11 PCI-E Video Card - PowerColor - AX5770 1GBD5-PPGV2 (AX5770 1GBD5-PPG) - in Canada
120 x 1.15 = 138
138 - 20(MIR) = 118 + shipping
I know it's a little over before MIR but it's always fun to get $20 in the mail lol
If youc an;t do that I recommend this
Buy the HIS Radeon HD 5670 IceQ 1GB DDR5 PCIe w/EyeFinity at TigerDirect.ca