SaSiMS is a very nice system but may be a bit pricey for a single aircraft operator - especially for one that isnt flying or may not fly for some time?
SaSiMS was actually my first choice and, had I controlled the budget,...
Like I said - the "ideal" systems are never cheap!
IMO for a single aircraft - even a T33 - you may as well use good old paperwork or an MS Access database (or even an Excel spreadsheet) and you can make then as simple or as complicated as you like. I'm sure there are lots of people out there, who are willing to show off their expertise in making and developing one of these. (and they might even sell it to someone else too!)