I would recommend something like this, even if it's out of stock right now:
http://www.airsoftgi.com/product_info.p ... ts_id=4196
Also, OE tech is actually Condor, but airsoftGI doesn't list it as such for some reason. You could also try something like the MPS plate carrier, which is a weesatch replica if I'm correct. I own one, and it's a great vest. It comes with built-i mag pouches, which'll essentially hold any kind of rifle mag out there.
Depending on your impression, I would say tan goes well with MARPAT. OD works as well, but it's not my personal favorite. And no, tan doesn't make you stick out like a sore thumb. Especially during summer, when we're playing in dead grass and the like.