it seems like most people are using CF frames, They range from about $20/$30 to $100 ++
From what I can tell the differences comes mostly down to how it was machined and quality of the cf... there are some videos on the subject on youtube talking about the cheaper frames having crappy holes and some motors rip through the frame on a hard landings...
You can get something similar to the f450 frame but just all nylon and 250mm and is about $12 i think... Its pretty good but no much space to mount stuff on...
It's the same frame on the fpv250 quad from hobbyking
I am personally just going to use 3d printed frames to try and keep the weight to the minimum, probably break on a hard crash, but resilient enough to take hard landings and thrashing it around
They have a large selection on hobbyking, I bet you could find one that will suit all your equipment.
A mini hexacopter would be pretty sweet..
I went with these motors and esc ( i paid for DHL shipping, should be here in a couple of days
cant wait)
http://rctimer.com/product-1131.html
( comes with 8 carbon props )
Looked at heaps of reviews and they seem pretty decent..
They are about double the power of my current mini quads motors (fpv250 from hk)
and this FC
https://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=68813
Acro mode, level and horizon mode... thats it for this one.. but 32 bit, should be pretty damm stable!
Some plastic props,
https://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=68813
3s 2200mah battery x2
I really need to get some more batteries...