Best mechanical SLRs?

I have recently been enjoying using a couple of old Minolta mechanical cameras that I picked up (SRT-201 and SRT-202), and was hoping for recommendations of other mechanical SLRs.

To clarify, I don't mind if there's a battery needed for the light metering system, but the rest of the camera should be mechanical.

I know the Pentax K1000 is popular, as well as the Nikon F2 and FM2. Does anyone use anything else by these brands? Are there any mechanical cameras that are particularly noteworthy from Mamiya, Yashica, Olympus, etc?

Olympus OM-1

Canon FTb

Not an SLR but worth considering: Minolta Autocord 2-1/4 x 2-1/4 Twin Lens Reflex. Using it will definitely draw attention.

Canon F-1 and the FTb are good choices also. Check out KEH Used Cameras for good prices and a return policy.

Olympus OM camera range are Excellent. Ricoh SLR are also good but always underestimated.

I personally Recommend the following…
Olympus OM-1
Olympus OM-2
Olympus OM-10 - Needs a Manual Adapter for shutter priority
Olympus OM-20
Ricoh KR-5
Ricoh KR-10
Pentax K1000