Chris
I highly recommend the Porter Cable/Optimum kit that you are talking about. Using the Porter Cable will take your paint to a new level, it will make a night and day difference.
After you polish with the Optimum Compound and Polish I would then use my OD Wet Glaze, this is really popular with all of my customers, the glaze will add a lot of gloss, depth and wetness to the paint.
After the glaze you want to put on a wax. This really depends on how much you want to spend. I have my OD Wet Wax that is a really popular liquid wax, then I have my high end carnauba paste waxes like my popular Wet Obsession and Dodo Juice Purple Haze or Blue Velvet for black. If you have the extra money to spend, I would go with one of the high end carnaubas, they will look amazing on black.
Check out this site for a ton of useful information on using the Porter Cable plus info on how to correctly break down polishes and so on... This will help you out a lot. Here is the link......
http://paintcare-n-detailing.com/
Since you are a member here I offer $10 off the Porter Cable kits and 10% discount off of products and accessories. Let me know if you have any other questions. Thanks!
Justin