I'm with ya OP😉
Almost ten weeks ago...I bought the 2.7/16/768 as well. Primarily because that's what the Apple Store had in stock. I definitely wanted the 16GB of RAM and the biggest SSD. Wasn't sure about the 2.7ghz processor, but what was another $250? We also get a little discount through Apple with our business. No sales tax in our market. And a tax write off to boot. Love it. No regrets. No 'issues'. No problems. I absolutely love this computer. My wife has the 2.3/256.
Congrats on your rig, and don't worry. If it was right for you, you've got nothing to worry about.
J