The Dell 1700 series have a good track record with our company.
We have about 4 of each, Dell 1700n & 1710n printers of this series. There is a little known feature in this series of printers, in the web interface, that can significantly lenghten the toner use. From the main menu, choose "printer settings" then choose the "Quality Menu" hyperlink. Here, along with DPI and picture grade printing, you will find a menu item called "Toner Darkness". The deafult setting is 8 (10 being the most toner used). I have set all of ours to 4 which is just about the border of where the lightening will beocme apparent but use a lot less toner to do the job.
I highly recommend them, even though we have had 2 them fail within a year for mechanincal reasons, which Dell quickly & painlessly sent a replacement. The other died in use after 3 years because the area in which it lived in accumulates a lot of gravel dust (warehouse) and the little rubber paper feed rollers dried out and jammed repeatedly until it could take it no more. But they have been an ever present all around workhouse for us here.
I lLike em, recommend em, and the use-and-return toners, to save money. Given a paper cost of $0.005, the total cost per page should be between $0.019 and $0.013(config tweek above) real world.
Our current oldest printer (dell 1700n) has 62,920 pages under it's belt and still moving right along.