I assume you mean at least a 14" screen.
If you don't mind refurbished, then this looks like a good deal:
HP Pavilion m6-1035dx - $479.99
Otherwise you have these:
Acer Aspire V3-551G-X419 - $599.99
SAMSUNG Series 3 NP355V5C-S01US - $689.99
Without knowing what purpose this system is going to be used for, I can't really recommend any of these systems over the other.
-Wolf sends