Erron used a paladin, cleric and three sorc's (see his post above).

This game is easier to solo then EQ was so you don't really need a full group unless that's what you want.

For my simple setup I have great opening damage, roots, snares, off-tank and fear (and I use it often) and that's with only two characters. I've experienced little trouble with multiple three dot mobs, even named ones because with fear, dots and snares I can keep them off my group quite well. If I had to add another character to my group it would be another necro or ranger. I personally can't imagine making it any more complicated then it already is.

After this first group, my plan was to level a pair of blood-mages. They have good synergy together with good damage & good heals.