We’d recommend you the 750i as that is the sweet spot in the entire range. It’s adequately powerful, has a V8 engine and is plenty fun to drive. However, if you really have your money, the M760i is really the one you should pick. While the 740e is pretty good on performance, it does not have overwhelming benefits of being a hybrid over the gas powered engines. You might as well splurge some more and get yourself an adequately powerful 7-series.