I enjoyed Dominion, and generally appreciate games where you don't have to
keep buying things to play competitively. I've never actually played it, but I was always intererested in Codex:
http://sirlingames.com/codexIt's modeled after real time strategy games (Warcraft 3 especially), and was designed by David Sirlin. Sirlin writes about game design, and I've really enjoyed his commentary on competitive systems. He did the rebalancing for Super Street Fighter 2 HD Remix, and the changes he made are discussed in a series of articles here: http://www.sirlin.net/articles/sf
You can various other articles he's written by clicking around that site.