Take a look at the following link. You might want to consider the Enhanced Image for its policing, marking, classification and DSCP mapping capabilities. This will be very important if you have endpoints that do not mark voice/video traffic with the correct QoS markings as that function will then be moved to the switch.
Depends what switch you're talking about - if 2950s, see the post from Brandon.
If 3750s or 3550/60s, then it probably doesn't matter. Both have the same QoS/PoE support, just different dynamic routing capabilities (i.e. BGP/OSPF/EIGRP support - Standard just uses static and RIP routing) and a few other features.
If you're just using them as L2 access switches SMI will do. It's also upgradeable for a license fee (it's the same hardware).
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