Those 2.0 video cards will normally work with 1.0 pci-e boards if your power supply is adequate and has the required connectors. Never heard of your ps; I recommend this one: http://www.newegg.com/Product/Product.aspx?Item=N82E16813157313.
Ocz is a pain with rebates, so keep all your receipts; test the ps first as you are required to send in the barcode off the package, so you won't be able to exchange or return it. I got my rebate after an extra phone call to ocz; they have an toll free number. If you don't want the ocz, checkout either antec or corsair.