Players who I consider slightly better than myself and remember being top-tier (in no particular order):
Jeep, Vi, Mastin, Glork, Regfan, Faraday, Thor665, Llamarble
People who I've heard great things about and probably would be on the above list but I did not have enough meaningful games with them: CES, Sotty7, Antrax, MeMe.
All the above I believe were ace as both town and scum.
Honourable mentions (in no particular order): AngryPidgeon, roflcopter, grapes, Nachomamma8, kanyeknowsbest, LoudmouthLee, Fate, Plotinus, petroleumjelly, petapan, Empire, mathcam, Talitha, Thesp