Power supply for a gaming rig

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

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

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

http://www.newegg.com/Product/ProductList.aspx?Submit=P...

XFX 650W XXX Edition 80Plus Bronze Modular $89 ($20 rebate, $4 shipping)
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Don't get those old Corsair TXs, there are newer, better versions available now, TXV2s.

he y i was wondering what was the difference between these 2 power supplies http://www.newegg.com/Product/Product.aspx?Item=N82E168... http://www.newegg.com/Product/Product.aspx?Item=N82E168...

One of them is modular, the other isn't. I don't think there are any other significant differences, they are both high quality, they have similar efficiency etc.
The non-modular Core Edition one is a bit newer than the XXX Edition, I would have thought they were intended to be a bit cheaper than the XXXs, but that hasn't happened.