Good upgrade?

[mufcmark]

Currently I have a dell dimension E521 which I got for free and upgraded the gpu and psu.

Specs

amd x2 5000+
2gb ddr2 ram
512mb Hd5670
Corsair cx 400

I'm going to take the plunge and build my own system.

Here's what I plan to build after researching components for ages.

intel i5 2500k
OCZ (2x2gb) 1600mhz ddr3
Gelid Tranquillo cpu cooler
HD 6850
Antec 100 case
XFX 650w pro psu (or a OCZ StealthXStream2 600w which would save me a few quid)
Asus P8P67 B3 revision

I already have win7 64.

Any suggestions on things that I should change?

And if I was to sell my old pc would I be better to sell my 5670 and cx400 individually and sell the dell as a whole pc with the stock components reinstalled or the sell upgraded dell as a whole?

Any advice would be great,

Thanks.

 

[mufcmark]

I have the OCZ special ops ram

I was lookng at the P8P67 motherboards and noticed theres many different versions.

I know that one is a micro atx motherboard but whats the difference between the LE version, the standard version and the pro version.

To keep costs lower, I think I'll get the le or the standard as I have no need for crossfire or sli.

 

[mufcmark]

Another quick question which psu would you prefer out of these two.

Corsair TX 650W or XFX 650w pro psu?

For around £10 more would the XFX be worth it?