If you'll only be using one card, you don't need 750w (unless that one card is a 7990). It is much easier to find a 140-160mm PSU around 500-650w than it is at higher wattages. Do you have a budget for PSU and GPU combined?
As I'm only looking at one card this time, I'm not overly concerned about budget (within reason!) so around the same total budget for one card and a new PSU - £480. Obviously lower would be better.
The PSU can be had for £100 (possibly less if I switch to 650W) leaving a fair chunk for a better card.
pandem0nium - I had the exact same target as yourself; 8350 at 5MHz. While I could achieve this, it never seemed entirely stable. May just be that I have a poor example. As the 9590 is presumably tested at higher frequencies than the 8350, I'm hoping to have better luck with it.



