Well, the KJW 1911 you linked to was upgraded with a bunch of expensive parts. It doesn't make too much sense to buy a gun for CQB, considering we don't do CQB very often at all. GBB's are fun to mess around with, but if you're going to buy a GBB, be aware of the hidden costs. You have to buy expensive mags, you'll need a holster, you'll need to buy gas...
I would recommend you either just keep saving money, or if you have your heart set on spending, buy some good (not over the top, a web set is fine) gear. You need quality goggles, gloves and pads, and get a jacket to go with those pants. Stick to the basics.