Ok, so for that mark you would have to add a bit more on for a G&P, they are very nice externals and good internals to go with it. Also, I don't own a metal gun but people on here say the novelty wears off. A Combat machine is great though, I have one, very light and very nice (the polymer is better than pot metal it is said which is cheaper metal used for some metal guns). G&G and G&P are full metal GBs.
That gun you posted, is in america. I didn't click on the link but you have to add import, duty and handling fees, which will bring it over the 200 mark. Also a decent bttery and charger (lipo) will cost £40.
Two tone, two tone...
I don't have UKARA (under 18) and I HATE two tone. the law is strange however, and certain boffins on here who know the law back to front - inside out, have told me that as long as you skirmish you have a defence, like UKARA. However, for buying black guns you need ukara, however when you get the gun and skirmish, say you have some pictures of yourself doing so or if your site owner is willing to tell a copper you do play at his site, then you are allowed a black gun. This means you can buy the parts that were two tone in black. I know you say lack of local events but if you can get yourself to skirmish once a month or whatever you are fine
hope that helps (please tell me if I got anything wrong)