Solo druid dual-class

[MarcoPoloPNG]

So, my solo HoF druid has just defeated Yxumonei (hint: Invisibilty potion + long duration summoned monsters = mega-cheese). Getafix is level 29 already and I think he will hit level 30 before speaking to Arundel again (obviously I have an XP cap remover....).

I'd like to try for a dual-class Druid 30 / Something 30 - I was thinking Thief because I really miss the hide in shadows / backstab / remove traps stuff, and also because a thief will level very quickly.

Anyone got any other suggestions?