i would like to referesh my company's GO and with 7613 router and has 2 6509E with sup720 core. it has a 4 MDF 6509E with sup720 also. now about IDF's i am confuse what i have to use. 4500s or 6500s. the main thinking is we would like to upgrade our desktop from 100M to 1G. so i have to think about the uplink between IDF and MDF.what is suitable for me in this case.