I will use any Nikon F, F2, F3, etc. they're all flippin' great cameras. As far as most "refined" I'd go with the F3, but my current "day to day" rig is a 51 year old Nikon F + 35/1.4-N:



I have 3 Fs, 4 F2s, and 3 F3s. They're all incredibly reliable and well made cameras. F2 has the best advance, F3 has Av, F is the most no-nonsense and pure. You seriously cannot do wrong with any of these bodies.