You can get a good rangie for about 4k. Take your time if you want one though and dont go getting the first one. I'm not that far from you, probably just over an hour. I know most problems that can happen and I could come out with you if you want
I've not had any major problems with mine (touch wood) but reading this forum, you get to know what to look for. Overheating is the main one. Get it up to temp and watch it. Smell for it running rich, easy one. Make sure it goes through all heights on the suspension. Make sure the aircon works. Everything is electric, so check fuses and relays. It is a pain in the arse, but if you check everything, then odds are on you'll get a good 'un.
Also, if you drive light footed, you could get 400 miles out yer tank. If you want LPG, that comes with it's own problems from what I've read on here. Sometimes it doesnt work properly causing misfires. It combusts at a higher temperature as well, which could hasten the worst case of a "slipped liner" as these are normally caused by overheating issues.