As someone who sells these phones, I have a couple of tips:
Do NOT buy sets of this type from E-Bay or anywhere else that will not offer a one-year warranty!
The keypads degrade badly from long-term use and must be comepletely re-built to have any assurance that they will last.
As a side note, the 67xx series does have some speakerphone models, but as the previous posts said, the 66xx series is generally a nicer phone.
For a speakerphone, you need a phone with an "S" or a "T" designator in the part number after the first four numbers. A 6614x is a non-speakerphone, a 6614T is a speakerphone. The 6600 display sets (and the 6700 sets) are all speakerphones.

[This message has been edited by paul144 (edited March 26, 2004).]