Fair enough to be honest I would buy a DERV if I could afford one I am just poor, well that's a lie I got the money I am just too stingy to make the initial outlay! 
all depends on your circumstances mate - problem at the moment is dervs are more expensive to buy in the first place and is more expensive at the pumps. you're going to have to be doing over 12K before you even see some payback
MKIV TDI's have held their value really well so buying one makes it harder
I'm hoping it i keep mine long enough it will increase in value

stick it on Ebay and call it 'rare' - job done

anyway - the seats will fit
