Sleeparchive - Disc 390, Shadow 390
Rhotwang - Frost Mage 390
Tessier - Affliction Lock 390
I do have a frost DK but haven't grinded yet on that one (only like 366 or something).
I play after work, so after 6 or 7pm PST. Tend to be available every day/weekend. As I make video games for a living, periodically I have times when I work 60-80 hours a week though that won't be happening much for a few months. I prefer a mature guild (regardless of age) that's less focused on trash talking and more on giving feedback/providing tips/strategy/etc. Won't reveal where i work unless I join (and uh no not Blizz) ;)
Don't wanna give out my real ID on the forum due to security concerns so just reply here or message me in game. ATM I'm grinding w/ Threejane, my frost DK, so you could try that route.