Keep your petrol and look at LPG. Modern conversions are excellent with no noticable loss in performance with the fuel tank normally taking the place of your spare wheel and just requuires you to buy a can of tyre weld instead. My colleague at work has just had his Lexus converted and it is hard to tell where the plumbing is and has had another fuel flap fitted to other side of car so no obvious signs. Has the tank in his spare wheel well so everything out of sight and had no problems oner the last 14months.
If you have to fit a diesel it has to be the I5 2.5 to avoid major engineering work to replace subframes etc. Will still be a lot more other items to sort such as fuel pipework and replacement gearbox, so probably cost as much as an LPG conversion....
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