A few upgrade questions

Need a little guidance please.

My Dad gave me an Emachine http://www.bestbuy.com/site/olspag [...] 8043606347

It pretty barebones The Mobo is a ecs mcp61pm gm http://www.e4allupgraders.info/dir [...] M-GM.shtml

I wanted to add a new CPU, has to be under 89watts so I went with AMD Athlon 64 X2 5600 Brisbane 2.9GHz 2 x 512KB L2 Cache Socket AM2 65W Dual-Core Processor

http://www.newegg.com/Product/Prod [...] 6819103234

I really need to add a PSU, thinking about this BFG - 550-Watt ATX Modular Power Supply

http://www.bestbuy.com/site/olspag [...] 8045945842

Lastly and most importantly I dont think my mobo has a PCI x 16 2.0? So I was thinking this might work? PNY - NVIDIA GeForce XLR8 GTS 250 1GB DDR3 PCI Express Graphics Card

http://www.bestbuy.com/site/olspag [...] 8071135693

I am just unsure if all this will work with the Mobo, so if anyone can add any insight I would really appreciate it.

 

your best buy link 404'd.