It all depends on what your needs are.
If you want to go advanced networking with VLAN:s and stuff like that then Cisco or maybe HP are the alternatives, but considering that HP is moving to be a services only company then I think that Cisco is the way to go. As for those of you who swear to Extreme - no thank you.
Another alternative would be Juniper, but they are a small player in the top level pond.
From what I understand, HP wants to stay in the enterprise networking market.
They just snapped up 3COM not that long ago to compete directly with Cisco on their Nexus series switches. They tried to offload their ProCurve unit many years ago, but then decided to hang on to it.
You can't beat a lifetime warranty on a switch.