I think the OP has already chosen a camera.
But I share your opinion that the XD-11 is one of the best small manual-focus SLR's available.
I just received one a few weeks ago from an apug member. It is a beater, with peeling leather and multiple scratches and wear.
However I was very impressed with the quiet and low-vibration shutter.
Of the lenses I have, the earlier MC-rokkor-qf's have a nicer build than the latter mc-rokkor-x's i have. I dont have any MD lenses to compare them to.
The lenses are generally a bit larger than the pentax and olympus cousins. Whether this is good or bad I will leave up to the user.