Arista or what Cisco should be
Well, Arista started out as the low latency switch.
However in my experience they have been adopted lately by other clients.
The reason for their success though is their consistency.
A single OS, the OS is identical to the Cisco commands we are used to.
The base of the switch is linux so you can run your automation if you are big enough.
Clarity is another key for them.
While Cisco and others are playing with stacking, fabrics, FCoE . Arista is keeping it very simple and using the tried and tested items only. So none of the above are supported but what is supported works great.
If you want an idea of the pricing.
Try this.
http://arista-networks.blogspot.com/
They are not cheap, but then again I'd rather pay more to get a consistently good product than pay
less and have to spend on supporting it.