An older 182 with the STC for mogas could work, I suppose, but that may be a bit more plane than I need right now. I know MAF has 182s with the SMA diesel, and that Deltahawk will be on scene shortly. While JetA would be reliable and available, for the price of entry (the SMA conversion) and the uncertainty of the new design (Deltahawk) mitigate against these choices.
You might like to have a word with Maule, their SMA powered model should be certified by now.