I went through some crashes on my Quad, and this is my solution.
It worked real well, I don't buy props that often now days!
I tried to reply to comments, but my reply link does not work or that may be me, who don't know how.
Anyway, to answer comment; Carbon fibre frame is 0.33 pound, flying time with it is 16 to 18 minutes with 5000 3s lipo
total weight on Quad is 3.42 pound excluding battery. flying time is gained by 4-6 minutes without carbon fibre frame (tape off to remove).
I have not thought about making a kit (It took me a lot of time + itchiness from carbon dust, headache from fume of epoxy). if there is demand, may be.
Quad is now very stable in NG code, PID tuning was very difficult though.
How I built is in my own comment on my blog along with some pictures.
Motor is e-flite 1020Kv, esc is e-flite 30 amp, prop is apc 12x6P electric. Video cam is 520CCD OSD & 5.4 Ghz Video Transmitter from DPCAV, 12CH Futaba T12FGH.