I was recently gifted a new Lenovo H430 desktop pc. It is an intel i3 3.4ghz with 6gb ram and a 1tb HD. Has only one PCI express. the HD and the CD-ROM are fine. I also like the case as it fits my space and has the front mem card reader, usb etc hookups. I have upgraded my psu to a 550w unit, and my ram to 8gb corsair vengence and added an nvidia GTX 550 TI. I would like to upgrade my CPU/Motherboard to an AMD FX setup up without sacrificing my case, HD, CD-ROM or losing the use of my front usb, mem card reader etc. My budget is only about $250 +/-. Trying to make an entry level gaming pc (TOR, Skyrim, WOW, etc)on a shoe string budget. Any advice?