I STRONGLY support the list you put out, with one exception: The GT500 strut mounts. Depending on whose CC plates you use, you may not need the strut mounts. It's been forever since I ran factory-style springs, but IIRC, the Maximum Motorsports CC plates only require the isolator portion of the strut mount, which is easly salvageable from your stock piece. I also believe this to be true for the Vorshlag plates, though I can't say for sure.
Tow hook: There are a LOT of options out there that don't require cutting the fascia, a bit of searching on the forum will turn them up.
And while we're on the subject: If you're going to be tracking your car regularly, then yes, I would opt to invest in a tow hook of some form. That said, unless you're in a competition group, it isn't strictly necessary. In a race group, if a car becomes disabled (and it's safe to do so), the safety crew will dash out, grab it, and drag it back to the paddock. No time to mess around with cars whizzing by, so tow hook is MANDATORY. In an HPDE setting, though, they have a little more control over the track, and can take the time to figure out how to hook you up, with minimum risk of damage to themselves OR your car. If you've been avoiding the big track strictly because you don't have a front tow hook, stop. Go out, have fun, and improve your skills.