Rogues don't require any specific attribute in great numbers, since even without intelligence they have more than enough skill points to cover their essential duties. I'd prioritize dexterity, to boost AC and reflex, then use a bow since your health will be pretty low. Barbarians also will likely be decent, since their rage boosts strength and constitution. The lower the point buy, the more benefit those +4s give you. Dexterity and constitution are probably key here, and probably a race like half-orc that boosts strength. Grab power attack and a two handed weapon, and you'll be able to put out some serious damage. There's an arguement to be made for wizards, since intelligence gives lots of skill points as well as higher spell DCs, and other than that all you want is a decent strength and dexterity. The low point buy won't hurt a wizard too drastically, but I tend to find first level wizards a bit underwhelming regardless (though that changes if the campaign is going long term, of course.) Finally, if your DM is allowing non-core classes, I have a soft spot for the Dragonfire Adept from Dragon Magic. Their at-will breath weapon based on constitution means no other attributes really matter, and since you don't need to make attack rolls, you can just wear heavy armour and not care that you aren't proficient.