New Computer

Alright, My computer (after 8 years of service to my family) is about to blow up. My mom doesn't want to pay for it (even though we all use it) and wants me to pay for the whole thing.
Since i just spent 131 dollars on beyblades I can't get the best computer , but I was wondering what are some good desktop computers under 400 (with monitor since my monitor is almost shot as well)

Also it doesn't have to have a decent/good hard drive , just good RAM I was planning to get a computer with good RAM with an decent/good hardive and then buy a 1 TB hard drive along with it.

Thanks in advance to everyone who helps

So far this is a good one i've been able to find http://www.officedepot.com/a/products/50...-Computer/

no monitor but i can always get a monitor separate