I checked the ATB coins but the list is all US coins. my actual favorite coin is the Kooks. like the ATBs they change every year.
Im gonna go with the 2013 Enhanced Uncirculated Silver Eagle. That is seriously the only modern coin that even excites me. That would also have to be my favorite series as well for modern stuff. These coins stay with the classical design of our walkng liberty halves (another beautiful coin), and its a large silver piece. Yup, favorite 21st century coin or series would definitely be the ASE
"None" for mr as well. Ever since all the coins lost their relief on the design, they just haven't looked appealing since. (Especially Jeffies and Lincolns -- it seems to me you can rub lincoln's head five times and it'll wear off!
If i had too pick one, it would be the ATBs, but I don't really like any of these much. I will say, however, at least the ATBs look better than the state quarters...