I've looked at both pieces, thought it's been a while (I ended up not buying either pre/pro and bought a piece of art glass instead, but I did put the art in the theater room!

). User interface and how you want things set up would be the deciding factor for me between these two pre/pro's, but both are very quality pieces!
If you want to use the balanced
digital outputs of your Cary 303/200 CD player, then I'd go with the Cary Cinema 11, and that'd make an awesome 2 channel rig. I got to play with an original Cinema 11 briefly a few years ago, but that's been a while, and it was a completely different set up than what any of the Anthem's were hooked to, so I can't really judge sound performance better or worse based on personal experience since the set ups were so different and separated in time.
With the Anthem processors, I have gotten significant personal experience listening to them (AVM 30, AVM 50, D1 & D2), and I think it's awesome equipment and very versatile set up wise. If you are one who likes playing around with different settings and plan on having more equipment hooked up in the future, the Anthem has a more friendly user interface and more set up options than the Cary Cinema 11. If you need to run video through the pro/pro, the Anthem is the obvious choice since the Cary has no video inputs. The Anthem has a great scaler, but it's still HDMI 1.1, so if you go to watch blu-ray's on it, I'd have the player do the audio decoding and send it via PCM to the Anthem, so you can enjoy the lossless audio codecs.
In a nut shell, if you are going to use it for mostly 2 channels, I might go with the Cary in your set up, especially with your CD player. If you were going more 50/50 music/movies or had a lot of gear or tweeking needs, I'd go with the Anthem. $1500 would be a great deal on an AVM50. I haven't seen one that cheap yet, but I don't look too hard b/c I might buy one.
The hole idea that you need the pre/pro and the amp to match in name brand is not the case unless you have a specialized set up like if I wanted to use the current inputs on my Halcro amp, I'd need a pre/pro with current outputs, not common...so I'd probably be more inclined to go with a Halcro amp. I literally have had twenty something amplifiers over the last 10 years and only a handful of pre/amps, all of different manufacturers, and I've never had a problem mixing them.
Just my 0.02... Hope it helps. Let us know what you decide.
-Brad