Help Needed For Buying Computer

I've recently been looking at buying a new computer and have decided that a Mesh Computer looks like the likely option. But, I have not decided what computer to buy yet, I am currently between the 3400+ offer and the 3500+ offer. By that information you'd pick the 3500+ but the 3400+ has better graphics (apparently-some people disagree) and 40gb more disk space. If people can give me their opinions on the pcs i would be grateful. I will be mostly playing games on it.

The 3400+: http://www.meshcomputers.com/updated/spec_mat3400offer.htm

The 3500+: http://www.meshcomputers.com/updated/spec_mat3500offer.htm

Thankyou