And while it goes without saying, I’ll say it anyway. You are after HOURS, not miles, and things like retractable gear, turbocharger, speed mods, etc., while they may increase the value and cost of the aircraft, will not help you with those hours much, and it’s just another thing to insure and to go wrong maintenance-wise. For that matter even the availability of 100LL fuel is far from guaranteed in some areas.
https://www.politico.com/news/2023/0...-fuel-00081641
Something low compression with available STC for ethanol free mogas may be a reasonable option.