Hi in your scenario
Since you have 250 PCs means you are using 10 2950 switches.
You can create a VLAN for each closet starting from subnet
10.10.2.0/24 and so on upto 10.10.10.0/24.
Connect all these switches to either 3750 – 12 G or 4500 Series Switch (collapsed core deisgn) with fiber uplink ports as a distibution switch, where you can configure your VLANs, enable intervaln routing , QOS service etc).
Make sure you have one switch as sever farm switch whihc is connected to your distibution siwtch.
Make sure there are no network loops in your network , which may force to hand your switches. If you provide your complete scenario with network layout a better solution can be provided.