I second YotaFun on this one. Building will get you what you want and they have several small form factors that really are kind of impressive. I build most of my own stuff.
Asus has outstanding quality. I run Asus motherboards, peripherals, and other parts. They haven't failed me.
BTW if you need help with a parts list I can help. I have built everything from 3k gaming rigs to sub 1000 budget builds. Putting together a computer is slightly similar to exensive Legos.
stamped and snail mailed