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Just get an older IOS based switch from eBay for learning, gigbit doesn't really add much in the way of CLI complexity.
For gigabit, I would highly suggest an HP Procurve switch.
But for your Cisco, try around $812!
Clicky
The point I was making is that there are only a handful of commands that are gigabit specific. You can learn 99% of what you need to know with the cheapo switches. Buy a cheap Linksys or similar for the speed.i already have 2 2900's i want to setup a gigabit network here and was thinking about getting a cisco one so i could learn with it also