Mobo and CPU compatibility

What PSU are you considering? So far, looks like a decent rig.

Ideally I would keep my current Antec Earthwatts 430w PSU. I was wondering if that was enough.

It would be on the fuzzy edge of being enough given the horsepower of the CPU and GPU. I would suggest (for the additional headroom) stepping up to the 650W class (or so). The GPU requires a 450W PSU according to its specs.

Technically, you would probably be okay at stock speeds, but you should definitely not try to OC anything with only a 430W PSU and these components.

If you were to add a PSU to the mix, what would be your planned budget?

They should work together. It's an AM3 125W CPU and this Mobo supports up to 140W.
By the way have you read Toms System Builder Marathon, December 2010. You could find some usefull tips in this article.

http://www.tomshardware.com/reviews/build-a-pc-overcloc...

They used an Antec EarthWatts Green 380 W PSU.
Your system will probably use more power though (Your GeForce is a 1GB 160W in the review it was a 768MB 150W and you CPU is 125W, I think they used a 95W CPU ? , but it should give you a rough idea of what PSU you need.

In my humble opinion it should work together, but I don't have a lot of experience, so someone shoud confirm, just to be safe  

Also from what I have read the GTX 460 has great Overclocking potential and it would be a shame to waste it  

EDIT: COLGeek is probably right about the PSU it realy is on the line.

If I am going to spring $450+ on components I mind as well foot the bill for a larger PSU. I have absolutely no overclocking experience and I would be nervous to try even with a more powerful PSU.

I read a scary review that the mobo I listed would not run the 125w version of the CPU. Any credibility to that?

According to Asus, the 125W CPU is fine:
http://usa.asus.com/product.aspx?P_ID=YATvwCy0OZLGNWwp&...

How much would you like to spend (not spend...) on a new PSU?

$50 or so? The plan was to not replace all my hardware during upgrade haha. At some point it might make sense to just build an entire new system and do an A/B switch on my monitor.

If you aren't going to OC and you can swing a couple more bucks, I would suggest this PSU from Seasonic:

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Only 520W (not in the 650W range I suggested earlier), but rock solid and very reliable. Seasonic makes some of the best PSUs in the business.

You can definitely find some great deals at newegg and get down to the $50 ceiling, but with PSUs, you get what you pay for.

Good luck!

Great! I think I will do that, thanks.

Do you have experience with memory? I see a bunch of options and many 2x2gb sticks for vastly different prices. Is there a rule of thumb on that - or just go with the lowest cost?

I look for cost, warranty, and user feedback. Unless OCing, go for stock speeds, lifetime warranty, and least expensive that have solid feedback.

The RAM you selected is ok, but I would suggest these as better:
http://www.newegg.com/Product/Product.aspx?Item=N82E168...