Took us awhile to get it done
We contemplated several architectures,
including putting all nets on Junipers directly and
using transitional cross-connects (tccs) that
allow bolting ethernets to atms to sonets.
Ended up deciding to use conventional switch,
because of high cost of 10G router interfaces
($110k vs $30k for switched), also no tcc IPv6.
Did side-by-side comparison of Cisco 6500 vs
Extreme Black Diamond.  Liked Extremes, but
no oc12 atm, and winning feature was Cisco’s
OSM-2OC12-atm 1483 bridged-routing blade