They're both fairly low-grade modular chronographs, but the Cal 12 is based on an ETA 2892 and the Cal 11 is based on a cheap Sellita. For $2500 I'd say the 11 would be worth it, and they'll probably get down there in a year or two. But given my experience with TAG I wouldn't be comfortable paying above 50% of retail.
Also - next year is the 50th anniversary of the Monaco, so it's widely expected that TAG will do something to recognize it - might be worth waiting a few months on to see if it's something more worthwhile than a Kickstarter-quality movement in a full-priced watch
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