I do like your Golf, but the VR is tempting. VR6 engines need work at around 100k, namely head work due to the kind of life its had. But you say its had a stage 2 head so the seals, guides and chains must be new or changed.
I'd definately check who did the conversion, what additional parts were changed like engine mounts etc, what mileage the engine had done before, whether it was overbored or was from a Corrado due to being 2.9l. I would think the history would tell you a lot, especially why they would want to swap. Seems like a good deal on your part to be honest!
And the best advice i was given before when i was thinking to swap my 16v for an 8v, better the devil you know!