Micro 4/3 and good lenses for cheap: Olympus E-PL1 with Tamron 135mm f2.8 (http://flic.kr/p/biBdGD) I got this for really cheap. The build quality is good, image quality is good, manual focusing is precise but requires a lot of turning. In-body stabilization is at its limits but it’s quite helped by the fastness of the lens.
Tamron Adaptall 2 lenses are often a good bet.
