I had a 1.9 BXE in a SEAT, also had a 2.0 BKD for four years, I definitely wouldn't buy a 1.9 personally, especially with so many throwing conrods out the engine block now (engine version dependant).
The 1.9 went to a family member cheap as the turbo sounded way worse than the one i replaced on my 2.0, 22k later it is still hanging on.
A mapped 1.9 perks it right up, but a mapped 2.0 is better.
Whatever you do, buy a six speed and not five speed.