I have an old Rolleiflex 3.5f circa 1959. Picked it up for $490 a few years ago - it has a couple of dings and is a bit of a beater but it works perfectly. It has a 80mm Carl Zeiss 3.5 Planar lens (Great lens although it suffers from flare a bit because the lens coating isn't that great). It has a built in selenium light meter which works perfectly (you have to use your brain though!) no batteries or any of that automated rubbish - Shutter speed, aperture, focus. That is all
馃檪 Here's a pic of it:
I reckon your best bet is to get an older TLR, Rolleiflexes tend to be expensive although you could get a schmicko one for under 1 grand. Yashicas, Rolleicords, even old Mamiya TLR's (although they tend to be quite big and heavy compared to the others) tend to be good as well. Also Agfa, Ricoh, Fuji made TLR's that you can get for a few hundred bucks these days. I would forget a Hasselblad (i want one too!), any of those TTL medium formats are expensive and tend to be bulky. I used to own a Mamiya RB67, that thing weighed an absolute tonne! and it was massive. Although that is a bit of an extreme compared to a 'blad. I have found just carrying a Rolleiflex when I was in Japan/HK was a bit of a conversation piece. Random people would come up to me and ask me about it.
Another alternative is to get an older folding camera, like an Agfa Isolette, Zeiss Ikon Ikonta. Although these are a bit more peculiar, and a big jump from a 35mm SLR outfit, might take some getting used to.
Also a lot of these MF cameras dont have built in light meters, so you should either look for one that does, or just get a separate one (this is pretty crap if you like doing any candid photography)
here's a couple of pics I have taken with my Rolleiflex:
http://img130.imageshack.us/my.php?image=04resize8ax.jpg
http://img130.imageshack.us/img130/4426/11a6hv.jpg
[ Edited on 22-10-2005 by Che Castro ]