All I know is parts for this car are dirt cheap. The car has had zero mechanical issues (checked with dealer) besides the blower that pushes the AC. For $8200 - I buy the car out for cash, and if something happens, I'm still way ahead and can easily afford a repair bill here and there. As far as parts for the car, there literally are thousands on eBay in brand new condition I'm already in the process of ordering replacement OEM parts to make her mint. What a deal!
I'll stop you right there. First off I'll say that your purchase is a plenty fine one. I can't say you shouldn't have bought the car. I have experience repairing most of the common issues on a family members BRM that seem to come up. With the experience and knowledge I've gained from that I would absolutely consider a BRM Jetta today, however it is a little small for my family.
It's a really cool little car. The Mk5 is really the last well built and quality Jetta. For the Mk6 in 2011 they started cheapening many things to get the price point down. Some things to make an example of this are going to hood props from the strut, and donut spare from full size. The Mk5 is really a great platform and the PD TDI is the very last of the non-DPF TDI's. BUT....
I think you may be a little over excited and don't have realistic expectations. I don't want to make your regret anything but I feel it's fair to be one of those that informs you of what you're dealing with here. You say parts are 'dirt cheap'? I don't really get that... I think overall VW parts are a good value (from the right source) compared to other brands out there. Tell me if you think these parts are cheap: Dual Mass Flywheel-~$350, Camshaft kit-$500-$1,400, Door Harness-$150, Turbocharger-~$1,000, EGR Cooler-$300, etc etc etc
Those parts listed are some of the most common problems that are a matter of WHEN not IF. You're at less than 50k miles right now so you may be doing pretty good. The cams start to show up around 90k and everything else can be sooner than that or later than that.
The labor for those parts is also very expensive. If you enjoy working on your own vehicles you could do much of those items yourself, however. That's really the only way to make owning a BRM financially feasible long term.
The good news for your and other BRM owners out there is this: Even though this motor was only used for 1.5 years their is a ton of info and support out there for it. You'll never be in the blind. There are more durable cam options, better EGR cooler options, and problem with the BRM are USUALLY very predictable. Most people who know the BRM well at all can diagnose one over the phone without ever laying eyes on the thing with 80%+ accuracy. They're just so predictable, which really is a good thing.
To sum up, you've got a nice low mileage car. Use OEM parts only for maintenance. Use the proper oil (I'm switching from Rotella T6 to LiquiMoly 505.01 5W40), be in tune with the noises of your car and drive the heck out of it. I see you've already made a post in the Mk5 section about a weird idle or something to that effect. You're a couple of days into ownership and already posting about a concern with your BRM. Get used to that. LOL But overall, if you're like me, you'll enjoy your car more in some respects with that because you'll be more in tune with it than an Asian car or something. It'll be your baby and you can inform yourself the best way to take care of it.
Enjoy your TDI!
