Sylvan Blades are known to myself and Nabal as they were a guild from our old server, and I have an old guildy in there. The head people are fine, I think they just grew a bit fast and picked up some baggage on the way.
Another guild you might want to look at is Soul Pact, I hear they are just starting on our server. They are a also from my old server, and a very respected guild indeed. Has older people in it, and are not growing too fast. I suspect they are not as casual as us, as before they were very active in RvR, but as time mellows all men I suspect they will have as well. I believe Tenpit is a gm. They will have a pvp/RvR slant.