Expedition cruising? That suggests blue water passages to interesting places, like maybe the Galapagos on the west coast or the San Blas Islands on the east coast of Panama? If that is your interest then you will ultimately need a much higher quality boat, like a Nordhavn or at least a Kady Krogen.
But a Mainship 40 or maybe the smaller Mainship 34T would be a good boat to get some experience on. There was a recent thread comparing the two-
http://www.trawlerforum.com/forums/s...0-a-30888.html
David