Actually, most of the really good 2h players use an agi build. I usually go for 18/21 myself, to be able to kill most people in only a few hits when my movement's good. (speed bonus is very important in builds like these)
I'm trying a 15/24 build atm (2 IF, 5 PS, 8 Ath, 8 WM), but I haven't reached lvl 30 yet, so I can't say anything about it.
Also, I've tried a 12/27 lvl 30 build with 4 PS, 9 Ath and 9 WM, it was a lot of fun to use it in combat.
You'll probably want to become good at blocking etc. before you try these builds though, as you're pretty vulnerable compared to a tanking build like 24/15 (5 IF, 8 PS, 5 Ath, 5 WM) or 21/18 (4 IF, 7 PS, 6 Ath, 6 WM) or even something more extreme.
Also, you could go for a build with only 36 attribute points, which will allow you to use a shield or whatever, while also being able to stack IF.
Either way, it's your call, I know I'll be going for a 15/27 build at level 32 on my next generation
Teresa