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You cannot stack 3750s with 2960s.
If you're going to use the 3750 as L3, you might need the -E suffix for full routing features.
The SFP ports are already Ethernet, so could you clarify what the other 4 Ethernet connections are for? If they're for copper, you could, I believe, use copper SFPs.
What help do you need in ordering hardware? You have the device model. However, for ordering, you might consider ordering a 2nd power supply for redundancy. Or, if you never need more ports, you might compare the price of the -12S with an uplink module vs. the -24S without.
