Of course you do, G4G!
Shep, buying a racket is one of the most personal journeys you can go through so it's tough to give a recommendation off the cuff. I just bought new rackets this year, and incidentally, new shoes. Sooo... I can at least help you with your purchasing strategy.
You absolutely have to demo multiple rackets. You've been playing for long enough and with enough success (judging by the GLTA thread) that you should take the time to find a racket that suits your game. My search was pretty long because I decided I wanted to change some elements of my game. I have always hit with sooo much topspin and wanted to flatten out my shots a little. I found some rackets with a bit more weight and a denser string pattern made a huge difference.
If you liked your previous rackets and are happy with your game, ask someone at a proshop what rackets are similar to what you have now. Take two or three to demo at a time. It's all about personal preference.
The biggest deciding factors are probably weight and stiffness (we are still talking about rackets, kids). Generally, players moving from 4.5 and up like a heavier, more flexible racket. These players can generate enough racket speed on their own. I'm guessing if you swing hard already, you may not want one of the lighter rackets, although there are some improvements in the lighter rackets lately.
Tennis Warehouse has a great explanation of all this. They also have an EXCELLENT demo program, if you haven't tried it. It's as easy as Netflix, I swear.
But I didn't fit the typical mold. I wanted a heavier racket with more stiffness. That used to be crazy talk. The Babolat Pure Drive rackets gave me what I was looking for. Trust me, my tennis shop carries everything except Babolats so I tried them all. I went with the Roddick Pured Drive + to be specific. Not just for the celebrity endorsement (although Roddick is one of the few pros that actually plays with the racket he endorses, not just one painted like it).
I love this racket, but it's not for everyone. It's heavy, but not inordinately heavy like the K-Factor rackets.
If you have a sense of the feel you are looking for (light, heavy, stiff, flexy), let me know and I can tell you what I demo'd in that category that I liked. I seriously searched for over 6 months.
As for tennis shoes, I'm an Adidas fan. The A3's are great if you want something light, but they run narrow. The new Barricade (4, i think) is finally a bit lighter than previous models, but isn't as light as the A3's. It is wider, though. Both these shoes carry warranties for the sole of the shoe. So if you wear through the sole in 6 months, Adidas will replace them. But they are both going to price at just over $100. If you play a lot, the warranty is a great deal.
I think the most important thing, besides comfort, is that the sole suits the surface you play most on. Don't get a soft nubby cross trainer and expect it to last on hard court or slide on clay.
Tennis Warehouse is also good for buying shoes. They'll tell you before checkout if they have your size. Returning shoes that don't fit is easy if you haven't worn them outside.
Whew, hope that helps.
If you're really good, you'll find comfy shoes that match your new racket, right G4G?