As the above users have said, I would highly recommend waiting for your UKARA before buying any guns. For now just rent until you are confident in your purchases. Plus two tone is nasty.
When you DO get your UKARA, I would recommend CYMA. They are probably the best bang for buck beginners brand out there. Known more for their AKs but they do have some decent budget m4s. That said, DO NOT be stingy when buying eye pro.
300 is definitely doable if you are only getting essentials, those being: 2 rifles (that probably come with one hi-cap mag each), 2 batteries, 1 charger, 2 sets of eye/face pro.