Hi Mate, Welcome and enjoy, this is my humble opinion. It all depends on what you want it for, if you are going to do a lot of mileage or pull regular weight I would get a 2.8 TDi, SWB lol, I am biased, I get over 30 around town in mine.
You would pick a nice one up for £ 1,700 - 2,000.
If you want something you can abuse and have some fun with you will pick up a 2.0 petrol one for around £ 7 - 800.
Regarding known faults, I can't help you there, as I don't have a lot of knowledge. Good Luck with your search and if you want one of the tech team to help you look over the Fronty they will for a small fee, I did it and at least I knew what I was buying, thanks to Mike C, Steve 1 and Pete Admin. ATB. Reeco