I typically transfer somewhere around 500kB/sec, and have gone as high as 1 MB/sec for internet downloads.
If I hop on Direct Connect, I have, on occasion, maxed out the transfer capacity of my NIC (12 MB/sec). It wasn't for very long, mind you, but I did it. So
to you, miss dual OC-48. My dual OC-3 and standard 100 Mbit ethernet works fine for me.