Looking to replace a 7513 w/ RSP16 and oodles of PAs (FEs, E3s, T3, STM1s and 2 GEs). Choice is either GSR, J M20 or 7600. In regards to the 7600 with SUP720 what limitations are there in regards to: multicast, IPv6, Netflow V5, ACL limits, and uRPF? Thanks, Hank