The Corsair 400 W PSU is Only $40 (after $15 MIR) an excellent choicehttp://www.newegg.com/Product/Product.aspx?Item=N82E16817139008
Your max Power Consumption should be no more than 300 W (with a i5-750 and a 5770 GPU. (My System)
The Corsair PSUs are an excellent rated PSU. The 450 Watt version is approx $20 more.
An Outstanding Corsair PSU with planty of reserve Power (ie xfire two 5770 down stream). $75 after $20 MIRhttp://www.newegg.com/Product/Product.aspx?Item=N82E16817139005
Bear in Mind you are trusting that PSU to NOT fail and wipe out your other system components. The Corsair 400 W whould be a better choice than the Antex Truepower even thought it has less wattage. Check out reviews. The Antec truepowers manuf several years ago were a mid level (quality) PSU. if I'm not mistaken.