The prices may not be accurate, but the parts are.
Both builds would work quite well, depending on what you would use it for.
Speaking of which, what resolution does your monitor have, and, what games will you be playing it with?
You get more for what you're paying with with the more expensive one, in my opinion. Cut out the CPU-cooler and it gets less expensive.
But the lesser one isn't very bad.
Regardless, thanks to price-changes, I will recommend either THIS GPU for less money over either of the two listed ones, USD 79.99 after mail-in-rebate
-or- THIS GPU for more money (but a better GPU than a 768MiB 460), USD 119.99 after mail-in-rebate.
As for waiting/buy now, I wouldn't know; I'm not American and I have no experience with your seasonal price-fluctuations.
If you have further questions, please do not hesitate to ask.