Doctor Proctor
First Post
The main reason is i want race to be Genasi really, and the way i see it is that if i go for Dex over Int im missing out over a +1 to defences.
Honestly, there's no reason why you couldn't just go 18 STR, 16 DEX and then 13 INT (with the Genasi bonus). You don't have to eke out every little bit of mechanical bonus out of the racial stats. You'll be down just a bit in terms of AC and REF, but only by a single point. The 13 INT will still get you access to a lot of INT based feats that Rangers normally don't have, which could be flavorful for your character.
One of the main reasons to consider keeping DEX though is that a lot of dual weapon Ranger powers work for both attacks with two weapons and ranged weapons. The ranged versions, however, are DEX based. See Twin Strike for an example. So while you could rely on Heavy Thrown RBA's, you'll get more flexibility and act sooner in the encounter if you stick with DEX as your secondary. Not to mention the class skill synergy and feat prerequisites for things you might like (such as the Paragon and Epic tier feats for Heavy and Light Blades).