rd1186 :
thank you for the help. One other question is that i see PSUs on ebay for around $20 for a 400w, is that something Iwant to stay away from.(really cheap PSUs that is) or are all PSUs pretty much the same? just wondering if it would be better to get a 400w to open my options for a new graphics card or just go with the 7750. It just seems I could probably get a better card for around the 7750 price if I were to get a 400w PSU. thank you again.
i am sorta against getting used pc parts unless you're buying from familiar people and have very good idea about the parts you're about to buy from him/her/them.
$20 for cheap 400w psu doesn't seem like a good deal. all psus are not built equal. even psus from the same brand differ a lot in quality. some purposefully use confusion in psu model numbering/naming to confuse customers. coolermaster, thermaltake are examples of these. avoid zebronics, frontec, coolermaster extreme power plus, iball, raidmax psus.
corsair, seasonic, enermax, antec have some good psus available. you can even recycle a good psu to a newer build. you can easily run a 7750 off a corsair cx430 v2 or a corsair cx 500 v2. check your pc's psu specs, if it's an atx mid tower, any of those psus should fit fine. i'd recommend the cx 500 v2, just to be on the safe side. if money's a problem, cx 430 v2 would do, seeing how you've managed with a 300w psu so far.