To better answer your question can you tell us how many access switches you are going to have? Also, do they connect to your VSS core via fiber or copper? Are your server switch and backup server switch in the same location?
That will tell us how much capacity and scale we need to be able to accommodate.
3850 vs. 3650 gives you some more bandwidth in the stack (if you stack them), more APs can be supported with the built-in WLC (if you use it), and the uplink modules (for SFPs) are completely modular vs built-in and fixed at purchase time (as they are on the 3650)
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If you have budget for 6500 and VSS, you might consider a pair of the new 6807s with IAs for user edge hosts. Connect your servers directly to the 6807s, ideally with Etherchannel to each.
The 6807XL (setup in a VSS pair) with 6848ia Instant Access satellites would serve you quite well. I'm not quite following how you need 40 switches for 400 PCs and 40 servers.
You could also run a Nexus 5k core with FEXes for your servers and traditional access switches for your users. The 3650 or 3850 access switch would be a good choice. With VPC technology you get some of the benefits of VSS.
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