I have an MDD. I am hugely satisfied and pleased with MacPro. As for memory and prices, AMD had planned to use some FB-DIMMs. They have changed their tune. Intel was (obviously) planning to also, but will not be. Meaning we probably won't see FB-DIMMs, and especially with larger heat sinks, drop in price or increases in production to be substantial.
And the price currently between Kingston, Micron, Apple, don't look to be that wide currently.
Most of the kinks seem to be with BootCamp and Windows, and some of the first weeks of shipped systems. Already there are later builds of OS X.
For me, there is no hold up when trying to do anything, whether opening 30-40 web pages at once, saving a 5MB photo, or doing a backup. Things that would push cpu to 100% now might push one core to 100% but not even a bump in the road. And do all that and more. It was getting frustrated for me to have to wait.
It is nice to not have to turn up the TV because the computer is running. There is a hum, it isn't dead silent, but nothing like what I had to put up with before.
I was going to wait, like you, for "kinks" or rev 1-itis, and so I could save a $$$ bit more. I have been planning to buy
something new for years and the MDD was more of a stop-gap because I didn't feel the G5 was it. Glad I didn't then, and even more so that I didn't wait until January. I figure that production shuts down here and abroad and it takes a while to get back on track.
I would say next month, 18th, put in your order. Gives you a month to sort it out.