I'm very curious as to what other, if any, CCGs / LCGs folks that play DTR play. I came to DTR via Doomtown Classic. I have a fondness for many of the CCGs from the great CCG explosion of the early to mid 1990s. I have a complete collection of Shadowfist, which is both my favourite game and my favourite CCG - and we still play it fairly regularly. I was playing Doomtown at the same time I was playing Shadowfist, and they've botth be my two go-to CCGs. I love them both mechanically and settings wise.
I also have a fairly extensive collection of the Decipher Star Wars game (which I rarely get to play), the FFG Call of Cthulhu (which I tend to get to play once a year at Origins), Old Legend of the Five Rings (which mostly collects dust), & Babylon Five (which had great mechanics, and now collects dust). I also am a casual Netrunner player, but I find the tournament environment just too intimidating for that game.