Right having just read the whole thread ( yawn ).
1. Forget snipers, GBB even NGRS/ ERG and get a bog stock AEG.
2. Don't spunk all your budget on the gun, you need mag, batteries/charger ( if gun includes it, bin it. Forget NIMh and go Lipo ), mask/goggles, LBE etc etc. Spend maybe 2/3 on the gun.
3. Visit your local site or sites and play a few games. Talk to regular players, we love to help newbies with advice. Some of the nicer players may let you try there gun. Try as many different types as you can. Once you know what type you like you can look at makes. Unless you particularly dislike em or really like something else an M4 is probably best choice. Also see what site uses as rentals, they generally use something very solid and reliable.
4. If you visit a site a few times this is defence sorted, if you wish you can then get this registered on the UKARA Database ( as long as your site is part of the scheme ) to aid proving your defence.
5. Try to visit a few large shops and again have a play or feel of as many different guns types as you can. Speak honestly to shop sales man and seek their advice, bare in mind of coarse they are probably gonna try and sell you something they stock.
6. When your ready to buy hopefully you'll have some knowledgeable friends buy then, take them to the shop with you. In Fact get there recommendation on good shops.
7. When you buy a gun buy the battery there as well and make sure it fits your gun before you leave the shop. Sounds obvious but, one M4 may need a different battery to another ( or any other gun ) so make sure you have the right one.
8. Buy a gun bag or slip, never carry gun uncovered n public or n a bag where the barrel or but may stick out.
9. Take you time think about it and don't rush out n by the first gun you see. At your budget you should get a good gun that will last you a good few years if you look after it.
10 Even at your budget a spring or hop up change may be a good idea, a good shop will advise you of this. IF however you gun is shooting at a legal power level this can easily be done at a later date.
11. Get out there with your new gun and enjoy yourself.
Goodluck in your new hobby / financial drain.