There's nothing particularly wrong with Horizontal cases, but towers have better heat management. Heat rises, so you put the hotter components lower and the heat moves up away from the components. Then the fans draw cool air in at the bottom, and push hot out the top.
I suggest looking at the Mini-ITX cases and motherboards. They're slightly better at heat, and while they don't always have room for expansion, most of the time you end up with a complete new system by the time you have any new one.
Definitely watch sales. I got in just under the price you're aiming for, not counting Windows.
I suggest looking at the Mini-ITX cases and motherboards. They're slightly better at heat, and while they don't always have room for expansion, most of the time you end up with a complete new system by the time you have any new one.
Definitely watch sales. I got in just under the price you're aiming for, not counting Windows.