What could possibly be more valid than Dexterity? You get into a fight with someone who doesn't have it, and both of you have to reload, you're going to win every single time, nothing gives that type of advantage. Dex will lead to many more multikills as well, I've missed out on so many multikills over the years due to havin' to reload, and by the time I'm done, they're gone, heh.
I already said Resupply could not be that great if the other people aren't using it as well, but the only 2 I see being better are Firepower & Shielding. I guess AA would be good if you're going to be spamming PV. I don't feel like Firepower is necessary because the pistols actually look like decent backup weapons, but I wish stuff like the AR/Storm Rifle could be used in that 2nd slot without FP, they actually look like they're not complete garbage this time around, but they're still not going to be good enough to be primary weapons...