What PSU should i get? CoolerMaster - Corsair - OCZ

Very worth get corsair txv2 750 .. It's good PSU

That cooler master unit is quite crappy, it has failed multiple reviews so its definitely a no go. The OCZ unit is less powerful than the Corsair 750TXV2, but the ZS series is good and it is significantly cheaper than the Corsair. The 750TXV2 is a solid unit and well reviewed. With the OCZ being $90 before MIR, and only $65 after compared to the corsair which is $105 and $95 respectively, the OCZ would be my pick on value for the money.

should i go with modular TX750w or a 6950 2gb dirt 3 edition

The modular TX750 is actually a whole different platform and its not very modular, the only modular cables are 2 PCI-E 6+2 cables, a 4 sata connector cable, and a 4+4 CPU power cable, all the rest are still hardwired. It doesnt perform quite as well as the 750 TXV2 but costs more for 4 modular cables so i wouldnt pick it over the regular TX V2

Just my opinion, I would go corsair ,and agree with hunter , he had good advise

should i go with a 6950 1gb or 6950 2gb

Hd 6950 1GB enough and worth and 2Gb just little faster. Keep your hd6950

or should i go SLI on a gtx 560 sli im thinking of going 850w also im striking out on my 1450 dollar budget

Corsair hands down... Coolermaster and OCZ PSU reviews are not even close to Corsair.

You can compare at johnnyguru site