A coworker of mine has a Pinnarelo cross bike (late 80's ish steel, but not lugged). I have also see a Guercottis cross bike as well. The easiest thing to look out for is a vintage touring bike. They usually came equipped with canti brakes and many had 27" wheels so you can fit big fat 700c cross tires with room to spare. I have an 83' Nishiki Seral built up as my cross/commuter bike and had knobby 700cX35 tires with room. The one thing is sometimes the conversion from 27" to 700c can be a pain where the brakes are concerned. A lot of the vintage bikes with canti posts had the post mounted too high to easily convert to 700c (pad needs to move 4mm lower from 27"->700c).