I'm going to say anyone that is mentioned in this thread:
To summarize: The Impaller, Duke, Ruthless, Gaia, Blue Precision, Fizzer, Waya, Pinkbladder, TeddyFSB, Doushibag, Chas, Eitz, Troll, Barney Stinson, Grundie, DAMP, Warrokie, WSUPapaSmurf, Perrin3088, willkay98. Those are just a few I rattled off the top of my head. I know there is a LOT more that we play with and I'm sorry if I left you out.
We tend to only play with each other because we like playing with people we have gotten to know over some time. We've played a bunch of 1v1 together and then big FFA games get created with the collective whole. We just like to try out new variants, talk strategy, and overall have a good time. One thing consistent with our group is that there is barely EVER a time when someone is booted. We tend to take our moves slowly at points and it's more at a leisurely pace.
Like Randy said, just try creating some games with us and challenging us 1v1. A lot of us have our preferred settings on our profile and if we don't, we'll play a game with your favorite settings then trade to ours. Thats what pretty much everyone in that 'class' has done to be a regular. You just have to make a name for yourself by playing with a lot of us over time.