While others respond with brands & models, I offer a few pointers:
1. Tall tower - Taller the better (unless you have space restrictions);
2. Either fans preinstalled or areas suitable for fan inserts / mounting;
3. Screwless access, e.g., Thumbscrews;
4. "Tight fitting" panels (quieter & cooler operation);
5. Castors - having wheels on a full-size tower is a treat ... I roll my box out from under a overhanging desk! Very handy.
I have an Inwin fullsize tower; 6 Panaflo Whisper fans: 4 x 120mm, 2 x 80mm: 2 front, 2 left side blowing onto motherboard; exhaust fans top and back. Large box has seen me through 4-5 AMD systems.
Pay the price, i.e. "You get what you pay for."
Good luck.
Brangwen