not a fan of fvie myself so always looking for out of the way locations.
Rathe mountain giant skeletons were not as good as I expected, on other alts they rock this level range but they have to much hp or I have to much med time for it to be really good but you could try it.
FM giant fort, I haven't tried this spot because there are usually groups there and I don't like disrupting people.
http://wiki.project1999.com/Wizard_S...Guide_by_Level
a lot of 1 or 2 mob spawns that can be solod as well but they weren't that good exp.
36-49 is a pretty crappy level gap