I am reluctant to recommend anything I have not actually used. My post was more to point out that “you get what you pay for” and that power supplies are often bought without much thought “Any old 500W thing should do” sort of thing.
They are critical to the long term reliability of a PC, and in some ways could be thought of as more important than other things (perhaps an extreme view!).
However, as DieSse has suggested, Thermaltake are one of the “better” and more well known manufactures and out of the two, I would go for that one.
Another but! It is important that you understand exactly what your requirements are. If you are running a large system with multiple hard drives, CD writers and large graphics cards in SLI etc. you will need a much bigger supply (heading to 1 kW) than a small computer with no graphics card.
I suggest you try to Google several reviews on PSUs, or, of course, some others on this forum may post their individual likes and dislikes!
I believe the manufacturer you linked to initially, PC Power & Cooling, make quality PSUs. Whilst T'take are a good PSU manufacturer, the one you've choosen is from their 'value' range (the TR2 gives this away)- a review didn't think too much of it click here.
With RAM quite inexpensive these days, consider 2Gb at the very least, & especially if using Vista as the OS.
Have you purchased the parts already? The 8600GT is OK, but for a possibly lower(?) cost you can have a better graphics card - a 8600GTS click here. G