Power supply for Antec P180

I am looking for a power supply to go with the Antec P180 case I just picked up (Black Friday sale). I am comparing the Antec Smart Power 2.0 500 watt versus the Antec NeoHE 500. I would like opinions on which would work better in the P180 case - is one quieter than the other? Is one better at cooling? Is one more efficient?

Does anyone have expereince with either of these power supplies? And/or with the P180 case?

You should read a review on Tomshardware, Anandtech or some hardware review site.

Or visit the Antec website, maybe it has specifications on the PSU's.

Based upon the research I've done so far, I'm leaning to the Antec NeoHE 500 Watt PSU. Would the NeoHE 550 be a better choice? Other than more power and a higher price, is it worth it? Are they both about the same in terms of noise level?

Well, it depends on what you need, example how many CPU, graphics cards, harddisk, etc you will have in your computer.

But 500w is probably enough for you.