Help with choosing PSU

[spudmonkey]

Hi all, I'm putting together my first PC and have a few of the basic parts already brought from Overclockers.

I will be buying one of the overclocked bundles, probaly this one http://www.overclockers.co.uk/showproduct.php?prodid=BU-117-OE&groupid=43&catid=2384&subcat= or something with a similar spec.

I'm having a hard time choosing what PSU I should be getting, or more specifically what wattage.

Should I be getting the 650 watt

http://www.overclockers.co.uk/showproduct.php?prodid=CA-027-SS&groupid=701&catid=123&subcat=2383


or the 750 watt

http://www.overclockers.co.uk/showproduct.php?prodid=CA-026-SS&groupid=701&catid=123&subcat=2383

What I currently have so far.

OCZ Vertex 3 120GB SSD

Antec 1100 Gaming Tower

Seagate Barracuda 1TB HD

MSI 460GTX HAWK ( will be replacing later with something better)


I doubt i'll be going crossfire/sli in the future, but I would like to have the option, but I don't know if the 750 watt is overkill.

Any help would be greatly appreciated.

 

[lee32uk]

I would go for at least a 750W psu if you want the option of crossfire/sli. This one is Seasonic made and has a 5 year warranty.

YOUR BASKET
1 x XFX 850W XXX Edition Modular '80 Plus Silver' Power Supply £99.98
Total : £110.48 (includes shipping : £8.75).

 

[Dom86]

If you want the option of going sli/crossfire go for the 750 otherwise the 650 should be fine for a single gpu.

 

[spudmonkey]

Thanks for the quick replies, i'll definitely go for the 750 watt then, it's nice to have the option.