Wow, you and previous owner took really good care of that car, looks brand new!
You sound like me when I first bought my Z, tried to be conservative in mods for the first 2 years then all hell broke loose
Personally, I would just add aftermarket wheels and call it a day. (but I'm a wheel whore) and there is a whole thread about adding aftermarket wheels with no suspension mods and it really looks good with this car
Sounds like this is not your first build anyway so you know what you're doing. Will see how long you can last without doing more