Honestly, the 3550 with the EMI code base is a more capable switch in some areas then the 6500 series chassis. The 6500 has a larger port density so that is something to consider. But on the 3550, any port can be a router port and the router on a stick for vlans is no more. Also, the 3550 supports the newest spanning tree protocol and VLAN access lists.
So some homework is needed here. Port density will probably drive alot of the specification. Whatever you do, seriously consider TWO core switches for redundency. NOthing ruins your parade sooner then the core going belly up in the middle of the day
If you have fiber, you are ahead of the game already.
---edgeswitch---fiber-----perimeter---fiber---core
The edge will aggergate the users to a pair or more of fiber runs. The perimeter switch just aggergates the edge devices. Not a requirement, just a nice to have. THe core is is the core of the network. The server farm should feed a perimeter switch which feeds the core.
cabinet1------------|
cabinet2------------switch------------core
cabinet3------------|
MikeS
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