1. Surly Karate Monkey ($)
1.5 Van Dessel [censored] ($+)
2. Salsa...anything! Or Niner, scandium! ($$-$$$)
3. Soulcraft Holy Roller ($$$+)
4. Titus or Moots...several offerings ($$$$+!)
I'd personally stay away from aluminum, aluminum is for beer cans. Scandium is a much, much better frame...