Great shots! They make me more excited about trying the C220 I just got. Can you tell me more about where you got the film scanned (and, I assume, processed)? I don't know what The Lab is.
I thought about going for longer telephoto lenses. But I figured I'd get the wider aperture and use the bellows.My C220 came with 80mm and 65mm lenses. They'll be enough to get me started, but I'm keeping my eye out for longer twin lenses. Your 105mm gets good results.