I mostly shoot Leica M, but also have a some SLR gear that I use when framing accuracy is critical to me. Regardless of what type of camera I shoot, it's almost exclusively with a 35 or 50mm lens.
About a year ago I picked up a Nikon F3-P, which has become my main SLR. Why? It just feels right and is a joy to shoot. The motor drive is very good and I love the ability to remove the viewfinder for shooting over my head or from low angles. The glass is no where near as good as that for the Leica R, but sharpness isn't everything.
Over the years I've been paring down my gear. The more I shoot the less I seem to need. I'm pretty much down to 2 x M bodies and a Nikon F3-P. 35 and 50mm lenses for all. And lots of Tri-X.
That said I still have some items on the shelf.
I love my Leica R6.2. It's tiny and reminds me of a Leica M with a mirror box. The current 2/50 Summicron-R uses the same optical formula of the M version, so prints are a perfect match.
Then there's my IIIc. It's just fun to shoot. Somehow it's simplicity relaxes me.
For medium format work I use a Rolleiflex 2.8/80. It shares many traits with the Leica M. No mirror slap, dead silent, a blazing sharp lens that is relatively fast for MF, short focus throw, compact and low weight, very reliable.
I also have a Hasselblad 503cx, which I've held on to because of it's versatility. I switched to the Rolleflex, because the focus throw on the Hassy 80mm is a mile long and a nightmare for shooting action. It also sounds like a vacuum pump and will turn every head within hearing distance, when you fire it.
I tried cameras like the Canon EOS 1-v HS, but I just can't get used to autofocus. It also looks like a high-end DSLR, which makes it a target for thieves. And it's huge, even with a prime like the 1.4/35L.
I also have an old Linhof III that I picked up a few years ago for peanuts, from a Canadian Mountie (long story). I keep telling myself that I will use it some day for some grand project, but so far it's just sitting there looking pretty.
Someday I will have to add digital to my arsenal. I had a Canon 5D, that I had purchased for a project, but ended up selling it because of lack of use. When I do buy another DSLR it will be a Nikon D300 or D3, because of the ability to use manual focus lenses (as well as AF). I would like an M8, but since I'm not swimming in money, I need something more versatile for $5500.