This was my first 250 size, and I built it up to permanently carry a HD camera. The ZMR250 is amazingly versatile and there are hundreds of 3D printed options for it.
AUW is 615g, which makes it a little heavy, but it handles it well due to the 6" props.

ESCs: FVT Littlebee
FC: CC3D with Betaflight 2.1.3
Motors: Tiger Air Gear 200 (2205/2000kv)
Propellers: Mixed, usually HQProps 6035 (hard to beat for efficiency vs agility)
Battery: Multistar 1400/4S
FPV Cam: HS1177
OSD: Micro MinimOSD
HD Cam: Runcam HD 2
VTX: Aomway 200mW
Antenna: Aomway
Receiver: D4R-II
PDB: Diatone v1 upside down as middle plate
Other: 2xWS2812 LED 2x2, 3D printed parts (mostly my own design, available here: http://www.thingiverse.com/Arakon/designs), fpvmodel 4mm arms, custom top plate to go with lowrider layout.

   
   
   

Some videos:
(up to 1:10)