Carburo, I think Weston V (five) is the best, apart from Weston Ranger (which can be expensive, and which uses a battery!).
After that, a Weston IV (4), and Weston III (3).
Weston 3 is nice, but the dial is a bit too crowded for me, and the numbers are too tiny...
Weston V is your best bet, provided it's fully functional.
Also, check out http://www.westonmaster.com
if you haven't done so already. Lots of useful info.