Another thing that never get mentioned is the spec.
150's are 1.8T GTI spec as opposed to the 130's being 2.slow spec.
So you'll get sports suspension and 16" wheels, 3 rear headrests and rear belts, dodgy wood trim, and in addition to the petrol GTI, a 4motion front vallance. You are also more likely to find a 150 speced with leather.
This might not mater if you are going to put wheels and suspension on it, as the other stuff you can probably do without, but a 150 is still a 150. It's a bit like going out in the 80's to buy an RS turbo, but ending up with an XR3i