Excel .25's are widely regarded as one of the best brands you could possibly use, without using Maruzen .29 Grandmasters, but then you're getting towards weights that aren't practical for 330fps AEG's. Goldenballs tend to have a larger proportion of inconsistencies compared to other brands, but that won't matter as much for you as it does for me, I'm a sniper/Designated Marksman and you're not after the same level of accuracy that I am.
JG AUG's are good, gearbox wise but both people I know that have had them have had some sort of hop issue, though I would put it down to both individuals not knowing a thing about airsoft maintenance.
Side arm wise, save up the extra and get a GBB, it's not worth spending money out on AEP's because you'll be bitterly disappointed performance wise and they just aren't as much fun imho.
I'd personally go for the Military AUG, but I do like the integrated look and think the blocky rail looks out of place on that smooth AUG... Mmm smooth
Though, you do say you're going to be doing more CQB than woodland, it might be worth getting the civvy AUG, because you could run a red dot for CQB and a magnified optic for woodland. Or just a red dot, whatever floats your boat really.
Drop legs are the way to go for me, unless you want to go down the serpa/safariland route, in which case you can chest mount it (I don't think you chest mount a safariland), which I always thought would be awkward to draw it, or you could belt mount it which isn't as bad. But if you're going to run a drop leg serpa/safariland you might as well use a fabric dropleg, because you'll get the drop leg position without scratches on your slide from the serpa/safariland.
Get a 3 point. It's a 2 point and a 1 point mixed, 2 points either have to be so tight that they don't flop about on your back when you sling it, in which case it's a b******d to get it off when wearing a vest, and 1 points you can't sling it on your back, it just hangs.
With 3 point slings, you can set it up so it's a 2 point, then you undo a single clip and it immediately turns into a 1 point, and to get it to go back to a 2 point you just need to do that clip up again. No hassle, just simple simple slingy goodness
Any more questions, let us know
...And this was meant to be a short comment.