12 or 24 port 1 Gigabit Switch with 10 Gigabit uplinks?

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http://serverfault.com – I am looking for a gigabit switch that has 12 or 24 ports, and at least 2 10GB uplink ports (preferably SFP+). Can someone recommend me any models? I am having a hard time trying to find out. (HowTos)