While black might look cool to some, it really only useful at night or in some urban environments. Unless those two situations are going to make up the bulk of your playing (which they're most-likely not) then you'd be best off going with some sort of camo or at least OD.
Somewhat off-topic, but you mentioned the vest is a cross draw. This is really only my personal opinion, but cross draws are a waste of good vest space. Really only for a sniper do they make much sense. Otherwise you'd be better off getting a drop leg or even a shoulder holster for your sidearm and save the vest space. After all, the space that the holster takes up could hold at least four mags for your rifle. With the frequency you'll be using your rifle versus using your sidearm, you'll want the extra rifle mags.