No worries man, we're here to help.
anyway, the GS-600 would handle any single card you can think of. Although if you were looking for a CF/SLI setup in the future it may not be quite enough.
anyway, those two PSU's you mentioned seem a bit... iffy.. to me.
I haven't heard of 'Powercool' Power supplies, and by nature I'm wary of lesser-known brands because they tend to be not as reliable and made out of cheaper components.
anyway, I took a look at a few reviews, and I was kinda right. People haven't been very positive about the Powercool PSU's.
even then, I'm going with my gut here and giving you some valuable advise: Do not cheap out on the PSU.
most people who do that end up regretting it very quickly. a nice reliable PSU is vital, especially if you're using higher-end components, which I'm sure you'd rather not have zapped by an unruly no-name PSU.
If I were you'd I'd stay away from lesser-known brands (don't put much trust into random online reviews either because they may be biased), and stick with the more reliable brands. I'll go ahead and list some:
(these are off the top of my head so forgive me if I forget a few)
- Corsair
- Seasonic
- Antec
- Silverstone
- Coolermaster
These brands are probably the go-to if you want reliablility.
if you have any further questions please feel free to ask away!