Depth of feild preview, mirror lock up, spot and either average or matrix is nice. Range of primes and zooms. I use a number of 35mm for landscapes, my Sigma SA 9 has loads of features but does not have a good selection of primes. My Pentax SF1n and PZ1 have a great lens selection but lack mirror lock up. I do have a 42mm lens to Sigma SA/D adaptor. A recent Nikon or Cannon or Mintola have all the elements. On the cheap a N 90S. Older manual focus cameras such as Konica, Minolta and Miranda have good features and a wide range of lens but are getting long in the tooth.