Buying a new PC for under $400?

I currently have an HP Pavilion Slimline s5503w. So just about anything is an upgrade. I'm looking for somthing that can run a few tabs of youtube, and some low-moderate gaming. No battlefield or skyrim, just simply like minecraft and wurm. My keyboard, mouse, and monitor are decent and i can reuse. So basically, what would be the best tower i could get for under $400 to meet my needs? I've looked into building one but it seems very complicated

A store called factory direct is where you could buy your computer for under $400.

If you do. Try to get a computer with at least '2Gb' ram. Also, try to get a single or dual core processor that is running 2.4 or higher. Ideally.3.0GHz or higher

Bye
SC
P.S. An acknowledgement response would be good.

You can get 4gb for 400 i would rather build one but. Check on newegg.com or amazon.com