There's always a wizard robe +4 in the Lich's treasure chest in Skull Castle. I don't think I've seen the Oomphaz samurai armor before though... pretty cool [img]graemlins/thumbsup.gif[/img]
To make a solo game harder, try dragging along five dead bodies. That reduces your XP (I think), so you don't get as much. That made the Den of Thieves much harder... 1000 XP for Rumphy instead of 6000.
And I agree -- once you get to certain levels, you're really unstoppable. Few creatures can harm you, so it would be nice if the game adjusted. Wiz8 does that, and I actually find it too difficult that way -- guess I haven't played it enough yet