Well I was hoping to aim for the brighter side of 200bhp, and seeing as the 150 has the bigger turbo, uprated injectors and a front mount inter cooler as standard, it makes more sense to go for the 150 as the 130 would require alot more work and money, though I do see your point of the reliability of the 130, its just I doubt a remap to 170 bhp in a diesel would keep me occupied for very long.
The other car that I was looking at was the (and yes I'm about to say the B word) E46 330d, and get that remapped.