Choosing A Switch For Cabinet.

I'm planning to move my co-located server to a cabinet soon. We are adding dedicated web & database servers to take the load off of the main box. I will get one GigE drop in this cabinet, so obviously I need a switch.

No routing is needed on my end, so my guess is that the regular GigE switch would do just fine. But I have few concerns about my setup.

All of my servers have dual GigE port. My plan is to connect one to the internet, and another to a local private lan for SMB, database, SNMP, and such. Jumbo frame is enabled on a private lan.

Is there any 16-port switch that allows me to assign 8 ports into one virtual switch (1500-byte frame) and another 8 into another virtual switch (9000-byte frame) ?

On the internet side, I expect to be pushing around 300-400mbps, a bit higher on the private lan. I need a very stable switch that won't choke or crash at this rate.

I'd also like to be able to limit throughput on each port, and probably do port/ip filtering on this switch instead of iptables on each box. (Am I asking too much for a switch?)