I am struggling to belive that an insurance company would list a 150 TDi the same as the 130 TDi. Someone correct me if im wrong.
quite a few of the companies struggle to distinguish between the 130 and the 150 i think this is down to the DVLA database or something. when i was looking to insure mine, some companies would show it as a 130 others would give you a drop down and others would know its the 150
both are group 13 but except they are different levels.
If you can get the 150 GT TDi go for it! I hear they are good.
if you can afford to insure it then go for it!
most 150's will have most of the toys as the people that bought them new, had the money to tick most of the boxes, and most stuff can be retro-fitted. the only problem with the 150 is going to be finding one in your price range.
EDIT:
I may look into the 130/150's as with a remap there isn't much to seperate them. 
yeah you can easily get the 130 upto the same level as the 150, but obviously the 150 will have further scope for mods