If you're planning on running a lot of ports with the same qos policy then you should look at per-vlan QoS over per-port QoS.
This drops the TCAM and input/output policer use dramatically. I've done this recently for one customer with 5 * 48 ports w/ Sup4 and freed up over 90% of the policer/QoS TCAM use.
But then, you've mentioned you're running Cat4506's in the core, which implies they're not connected to end-users. Please elaborate a little more on the network design and I'll let you know what to look for.
So from your post I take it QoS sharing provides the ability to apply a QoS policy to a VLAN which in turn gets placed on all ports associated with that VLAN ?
I am planning on running the 4506 switches as core devices that connect to several 3750 stacks for user connectivity. There will be only be AutoQoS Trust DSCP commands entered onto the 4 or 5 Gigabit ports that connect with the 3750's.
* You then configure each port to use per-vlan QoS (qos per-vlan or something similar) so the policies get applied per-port but share the same resources (policers, tcam)
If you're using autoqos trust on five gigabit ports on a 4506 - and not modifying the default autoqos configuration at all - then a Sup4 will be fine. You won't even need per-vlan QoS. But if you're running 4 * 48 ports with QoS policies (as if you're using a 4506 as the edge switch) then you might need per-vlan QoS. :P
Let me know if you'd like to find out more about the Catalyst 4500 QoS and resource management - there's a few bookmarked Cisco site links I have which cover these topics.
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