I didn't bother with INT, if you use bows with high ranged damage then pump DEX, if you want to use bows with high magic damage then pump INT.
I put most points in DEX, SPI, STR and VIT.
Just make sure you keep Explosive arrows maxed at every opportunity.
Poison arrow is OK early on but useless later because it is a fixed increase which does not scale.
I always concentrate on skills which offer a percentage increase, ie Ranger strength as this will always scale up as you level.
At 25 I hit for over 2200 with EA. It's such fun to watch whole groups of mobs all fall over in formation