If you want to go Old School, grab a Selenium meter off Ebay for ten bucks.
Make sure the seller describes it as operational. The meter needle mechanism of a decades-old meter can get gooped up.
Here's a site describing a number of models.
http://www.jollinger.com/photo/meters/meters/agfa_lucimeter_s.html
More general info, including instructions, etc. at
http://www.jollinger.com/photo/meters/index.html
I found a Weston IV at a camera show for 3 bucks. It's accurate and works great for most subjects, although I'd hesitate to rely on it to meter a high contrast scene shot with slide film.
Any of the meters on the above site will be more accurate than a 'sunny 16' guesstimate.
As mentioned, most any digital or film camera can be used to generate an accurate aperture/shutter combination for your MF beast. I use my T90 and it's wonderful multi-spot meter when shooting my MF and 4x5 cameras. The results are dead-on, even when shooting transparencies.
-Greg