I wouldn't recommend buying a Dell printer. In most cases you can
only order the toner from dell's web site, and it cost quite a bit more than toner for other brands of printers that you can go down to Office Max, Staples, or Office Depot and buy the toner for.
Like other people have said the big advantage of laser printers is the number of pages you get per cartridge. So don't go for anything that has an all-in-one cartridge. You want to be able to replace the just the cyan when the cyan toner runs out, not all 4 colors.
Also, the cheaper the machine you buy, the smaller the toner cartridges will be (usually), which results in a lower page yield per cartridge and usually a higher cost per page.. If you check out the box for the toner cartridges it will usually say something like:
4000 Letter Size Pages at 5 % Coverage Print Yield This lest you know about how many pages you should be able to get out of that toner. you will want to keep in mind the cost per page when buying the laser machine. And keep in mind when printing in color you will almost always have some toner from all 4 cartridges, so figure each sheet uses at least 1 of those 4000 estimated prints from
each cartridges.
BTW, That 5% Coverage they refer to basically a standard single spaces page of text. So obviously, printing full page color photo's is going to take more toner than a sheet of typing.
That particluar info was taken from [ame="http://www.amazon.com/Brother-TN-115C-Cartridge-Compatible-HL-4070CDW/dp/B000SAB33U/ref=pd_bxgy_e_img_c#moreAboutThisProduct"]here[/ame], a Brother cyan cartridges for sale on Amazon. If you scroll down to the product description, you will see that information.
But if you compare that to the rating on an inkjet cartridge, they will claim to get about 200 Letter Size Pages at 5 % Coverage Print Yield. Considering the laser cartridges are only 3-4 times the cost for 20x the yield, they prices don't look so bad now.
Another plus of laser machines vs. ink jet, you don't have to worry about your cartridges drying out. The toner laser machines use (instead of ink) is a powder already and can't dry out.
This right here seems to cover a lot of information about laser printers.
What to Look For in Your Next Color Laser Printer
Hope that helps