I've already said I would gladly pay towards Tills and one or two others here.
I'm about to make my own investment - just finished an album using a Route66 and a Roadster simultaneously, with three mics on each cab going through monster pre's. I'm booking the studio for a day to get ten variations of exactly that tone down into my KPA.
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I heard some of your Route66 and a Roadster recorded tones in your car that day, sounded fantastic....no doubt about it, these are going to be very special Profiles.
+ 1 on your Till's cabs comment, those cab files are worth paying for.