As the RPG guy in my store, I would keep tables limited to 5 players until I am comfortable with the system. I personally like running 6-7 players for my tables, as that gives me a cushion so that I don't inadvertantly TPK my table. in Shadowrun, 6 characters usually means everyone has a unique specialty (face, rigger, mage, adept, street sam, hacker). 7 usually means something is doubled up, which means that that area is the team's strongest area. I have also been playing/running Shadowrun since first edition, so I have lots of experience with it. If you are near Carson City in Nevada, come in to Nerdvana on Highway 50 and ask for Mark the DM. I not only run RPG tables, I teach classes on the games and how to GM them.