I would agree with the BPF and CC. A look at an older "old school" twin such as 310 or Baron could well be a good idea. A nice low hour Baron would be attainable for a surprisingly reasonable sum. If you buy well then any difference in fuel costs can be put aside
Someone once said something to me regarding fuel costs for light aircraft which made a lot of sense. It went along the lines of sorting out all your fixed costs first. Best deal on insurance, within reason keep it where hangarage is reasonable etc etc. Then if you want a twin it shouldn't cost a lot extra per year. I know these should be obvious but I have seen a few people who haven't been on top of all their fixed costs and have been handing over a lot more than necessary.