It looks like a reasonable kit, provided you're ok with the Griot's random orbital. I've read good things about it, but own a Porter Cable myself. I don't have any experience with the Griot's product line, so can't offer any comments on how well they work.
You might want to take a look at other packages available on the
www.autogeek.net website. There are a bunch of Porter Cable/Pinnacle wax packages and Porter Cable/Wolfgang products packages for less than the package you listed. The Pinnacle products are good, I've used the XMT swirl removers on the NSX. I'm also using Wolfgang Fuzion on the NSX.
autogeek always runs specials, either free shipping, 15% off, etc. Also try their alternate sites,
www.pinnaclewax.com or
www.wolfgangcarcare.com which sometime offer better prices on shipping.
I spend way too much time on autogeek and do a lot of reading in the car care section of the Corvette forum where the autogeek crew hangs out.
One other site to check is
www.detailedimage.com. I think they've occasionally checked in here on Prime and they also answer questions in the Vette forum.