cross6, Dell's previous generation switches were good. I do not like their current generation switches.
Dell's service and support is "award winning." I can't express what award they deserve in terms polite enough for a public form. I will simply say that you better hope you don't need support or warranty service on any Dell product. Luckily, their switches are pretty reliable. Software bugs are an issue but you can usually work around them.
I would strongly recommend that you consider SMC. They make solid switches, and back them with a lifetime warranty (how often do you see that in the tech business?). They aren't quite as cheap as Dell but are a lot closer to the Dell price scale than they are to the Cisco price scale.
Also check Cisco's "Catalyst Express" switch line. They look nice on paper, and they're not quite as much of a rip-off as usual for Cisco. I have not yet figured out where the catch is with these switches. When I see a low-end product from Cisco that's cheaper than usual, usually it's crippled in various ways.
While a managed switch is more expensive, in a business setting, you want a managed switch.