Firstly, never buy cheap crap at any level. Your starting budget is really good, but get what you need as time goes on. Don't cheap out to buy everything at once.
You can get a G&G gun for $200 - $300. That's about the cheapest quality gun you can get. Luckily, they have several variants to choose from. If you want to go higher quality, get a VFC, they'll be around $500 and up. Get yourself some high grade BBs to shoot, such as BB Bastards, a good balance charger and lipos, such as the Turnigy Nanotech batteries and IMAX B6 charger, which run about $8.99 for a battery and $36.00 for the charger respectively. They can be purchased from Hobbyking at the cheapest anywhere by a margin. Make sure to order from the U.S. Warehouse option or you may be waiting awhile for your stuff. A box of magazines is usually about $50 - $60. Read I depth reviews as many mag brands suffer from incompatibility, wearing out too fast and/or not feeding properly. Get some minor upgrade for your gun as well, starting with the hop-up, barrel and nozzle, to get better performance and consistency before shear power. Brands like Lonex and PDI make quality parts.
Other than that, get a great set of ballistic goggles with either thermal lenses or built on fans to help fight fogging. Many fields require full seal eyewear to play. Valcan makes a set of thermal low-pro goggles for about $40. Military supply companies such as Revision, EOS, Oakley and Smith make loads of ballistic eyewear as well.
Gear is what you want it to be, but I recommend lightweight, low profile and real steel gear. Get what works, not just what you think looks cool.
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