I think Vxlv6's problem with Dti is the cost of repair. Did I read fuel pump issues somewhere? And a £700 bill, just for the part....? Or similar? 
Yes, to explain, There are three options for repair:-
1) Complete new pump with EDC (control unit), dealer price approx £1700 + coding (and obviously the job of locking the chain, removing the old pump and fitting the new etc)
2) Refurbished pump, EDC coding, same removal and fitting work as above, approx £1000
3) Removal of EDC, diagnostic, repair, refit (some dismantling of the fuel feeds and inlet to get access required), approx £400 - £500
While the last option is obviously the most preferable (it's highly likely to be the EDC, although the pumps do suffer with wear if run using cheap supermarket fuel) I have to consider the fact that this car has done over 170K and the thought enters my mind, 'What happens if the turbo or something else expensive dies on it in a few months time?
So looking at the problem from a slightly different angle, suppose I purchase a 2.6 Elite with driver involvement pack to hopefully gain a few more MPG to start with, I've then got the DTi which has the same paint colour as my 3.2 so I can potentially can use body parts if required. The NCDC, CID, Polly bushes, front wheels with good tyres, 10K front shocks and springs, B4 rear shocks, rear blind and a wealth of other 'Elite' parts could then be used on the replacement 2.6, the Diesel parts that are still in good order could be used as spares for Mrs VXL's DTi estate, therefore my DTi helps keep three Omega's on the road. The Bose and other parts can live on Ebay and eventually the shell can go to be weighed in.
I already have a drilled V6 inlet manifold ready and waiting and I believe virtually everything else required for the LPG install can be bought for approx £700.
I've half convinced myself that this is the way to go... I just need to find the right car.....