the 20/30 mp backs do not have the larger sensor size. if you go cheap, you'll be stuck with a non-modular system like pentax or something and with a sensor size that is merely a hybrid 35mm/MF size. you'll need to invest a lot more than 10k. you could rent and see what you like.
2009 135i | space grey | sport | navi | hifi | heated
dinan stage 2 software | bmw performance exhaust
kw v2 | hotchkis front sway | vmr v710