If you want something really light and you are willing to give up spot metering, the Voigtlander VC meter II is awesome and small, "spot on but no spot". Particularly good on rangefinders.
For spot meters, my suggestion would be to look at one of the 3 modern ones, (in no particular order of preference):
- Gossen Starlite - probably the most streamlined user interface for basic functions. No indication in spot viewfinder.
- Sekonic 758 (or earlier model) - the most complete in terms of functions, user interface possibly a bit complex
- Kenko 2100 or 2200 (carried over from Minolta) - perhaps in the middle in terms of user interface complexity
They are all convenient, precise, and run for ages out of a single battery. I have the Kenko 2100, bought used for ~$230, and have been pleased with it. They run for about $600 new. (look on the used market)
Sekonic just introduced a new model, the 858, which seems to be a monster of a meter (in a positive sense). Unfortunately, from reading the user manual, it seems to lack a simple EV display of the measurement. This is a real bummer for us analog shooters, in particular with cameras heavily relying on EV settings (Hasselblad, etc.) I will try to see it in a store to confirm this fact, but I haven't seen it in stores around here yet.
Hope this helps!
Etienne