I've accumulated a few meters over the years. The Minolta Spotmeter F is my most used spotmeter. I also have a Pentax Digital, the 7.5/15 degree attachment for my Profisix and the spotmeter function on the Sekonic L-508C. I use the L-508C more as an incident meter than a spotmeter because of the lack of a display in the viewfinder. I have a few other incident meters, but this is a thread about spotmeters. However, I think that Phil Davis' discussion about the benefits of incident metering over spot metering (in Beyond The Zone System) is worth mentioning.
Best,
Helen