which classes are most wanted in groups?

[rittmeister]

hi guys!

So, which classes are most wanted in groups and have fewer people playing them?
Also, please add if they are decent to solo with in case one can't find a group.

I currently play a 39 Necro and nobody every asked me to join a group or replied to my occasional LFG. Yes, sure I can solo, but It's also sad that nobody seems to want to group. I just duoed once or twice in Kunark.
So, I'm thinking about leveling up another class besides Necro. I got a Druid already at lv9, that any good for grouping?