I would honestly go Zerker. The pking on zerkers is pretty great (good profit). like @drewyboyo said you can boss on a zerker which is even more profit. When i was making my zerker i used this guide which helped me alot.
http://forums.zybez.net/topic/1574534-ultimate-rune-pure-guide-trainingquestsitems/
Hope that helps you out. It pretty much lays out everything you need to know. Quests, etc. .