I personally went for a dex build, but at the same time didn't kill all my strength. It depends on what weapon you're going to use. The longbow is my favorite, so I did what I could to make dex my best stat.
At level 20 I can get my 28 point build elven AA's dex to 36 (That's without having modified any stats when I built my character), and my strength to 23. I use mostly bows, but if I need to I can whip out a pair of scimitars and have no trouble using them.
If I ever manage to get my hands on a greater heart of wood, those extra points are going into my dex stat.