Wonderful, glad you are happy and "way under budget" is a decided bonus as well! With regard to the MX5, an ex-colleague of my partner had one, and my partner says that when, on two occasions, he drove it, he couldn't see what all the fuss was about......as you say, definitely didn't have "IT".
My partner was originally looking at acquiring a Series 1 or 2 RR Silver Shadow, but when it came down to it, something wasn't quite right. We then found ourselves looking at a Bentley Arnage as the high days and holidays motor, with a S-type as more regular use (we also have a Citroen Picassa as the "lorry/dog taxi"etc etc). My partner then exclaimed "there's only two of us and we travel light" so, for high days etc, why do we need more than 2 seats?! Enter our '07 XK and the S-type for more regular use.....and, yep, they both most definitely have "IT". Never looked back. Strange folk, aren't we!
With regard to add-ons, we are definitely in the "as it left the factory" corner. Our S had a mesh grille at production, and we do, actually, think the mesh grille looks better. With regard to a bonnet-mounted leaper, it's not for us unless we can afford a nice Mk2 which had it from new. That's just us, and we suppose that we haven't got the courage to drill holes in a perfectly serviceable bonnet! We, as you seem to be, fall firmly in the "as good as she can be" category, and that is the satisfying part of ownership. No crawling around underneath anymore, but plenty of carnauba wax, tyre gel, cotton buds and what have you.
Looks like you have definitely been bitten by the Growler bug, first symptom of which is a permanent facial grin when behind the wheel.