Duelist Legacy was always one of my favorites to read (back when Riley wrote it full-time). Frankly, it still boasts the best use of the Talisman and Sealmaster cards that I have ever seen. There is noticeable progression in Riley's CAC-creating skills as well.
As a reader, you can really get behind several of the characters in Duelist Legacy. There's a lot going on, but not so much that you lose sight of anything important.