This is a 250 size quadcopter. The flying controller is a Crius MWC board, which can use 8 motor. I use MultiWII v2.3 firmware. The flying weight is ~580g. The battery is a two cell LiPo 2200mAh, the flying time ~7 min. The body has enough space for FPV system.

Electrical parts:
Flying controller : http://www.dx.com/p/crius-mwc-multiwii-se-v2-5-version-multi-copter-4-axis-main-flight-control-board-blue-227394#.V8poyvmLTIU
Motors : http://www.dx.com/p/4-x2804-2280kv-cw-ccw-brushless-motor-4-15a-esc-2-pairs-of-6045-3-leaf-nylon-propeller-set-382471#.V8pqlvmLTIU
RC system : http://www.dx.com/p/flysky-fs-t6-2-4ghz-6-ch-2-9-lcd-tx-transmitter-rx-receiver-radio-control-system-black-8-x-aa-178448#.V8pq2PmLTIU
Firmware : http://www.multiwii.com/wiki/index.php?title=Main_Page#Software