First off, rent and rent trying different sites, styles and weapons. Find out if airsoft is for you. If it is get a site membership so you can buy a RIF and not a 2-tone (controversial I know).
Regarding rifs. Spent just under £300 on an G&G AEG plus battery and charger a year ago. Been used and abused in all weathers. Not missed a beat. Did the same for my son and it lost a screw of the hand guard first time out but apart from that also been solid.
Stick to a brand, see what other players use.