10g ports with redundancy

Hi all. I hope this is the right section to post this kind of question.
Basically I need to know which switch should I buy to achieve the customer's needs.
Each floor will have 1 x 2960 with 2 10GB uplink to the core switch. The problem is I don't know which switch should I buy acting as a CORE. The customer needs at least 16 x 10G ports for each switch and the core must be redundant in some way. So the 3750 is not an option and I thought about the 4500-x with VSS but actually I'm not sure this is the best idea. Servers will be attached directly to the core switch (I know, this is not the best idea but this is what the customer want to do).
Thanks for you replies / help
Regards

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Yes, VSS with the 4500-X is one possibility, as would be the new 6880.
Or, instead of VSS, you could use a 4500, 6500 or 6807 with dual sups and dual line cards.
With VSS, your single point of failure is the IOS.  With the (redundant card) chassis, your single point of failure is the chassis, itself.  There's not much of a difference in MTBF.
Any of the above (or Nexus) would likely work well for you.  Selection depends on your budget and feature requirements.

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