What about a Blackout 330:
http://www.minihquad.com/frames/blackout-330seems a very good frame. Nice for flying fast and sufficient space for FPV and GPS.
Another, slightly cheeper frame is the Flying Cinema Tankito:
http://flyingcinema.com/tankito30cf.htmldesigned as a fun video platform.
the original DJI flamewheels seem no more available, so you would need to chose a clone if you still want to build one. If you change your mind and want to look for 450 frames, TBS Discovery or Flying Cinema Cinetank seem to be good choices
My cinetank originally had no gimbal and was great fun with that setup, but finally I added the gimbal now