I agree with kthompson that you should look around at what the lawn care companies are using in your area. Not all decks cut all grasses in all areas of the country equally well. Some seem to handle northern grasses better, while others seem to handle southern grasses better. Some handle wet conditions fine, while others seem to clog up and/or blow clumps when it's wet.
And noticing what brands the lawn companies are using may tell you which brand they find more reliable, or at least which dealer has the best service. Those guys can't afford to be down for repairs.
In my area, I see Scags by far the most often. Then it's probably Grasshopper and John Deere, followed by Toro, Gravely and a few Exmarks.