Since canceling my home phone I have been using skype to make calls from home. I never really liked using a headset on my PC, just something weird about it. Also you are chained to your PC. I know that there are a few USB cordless headsets out there, but none of them work in Linux.
I really wanted a router with a wireless headset, but they were so expensive! Recently my local Wal✭Mart was carrying GE 2 in 1 - Internet & Standard Phone 28319EE1 — for $179.99. It wasn't selling for that crazy price and so after a while it went to the clearance rack. I watched the price drop $10 a week and I said to my wife that if it went under $50 I would buy it. Well it did it hit $45!
The phone works very well and the sound is great. The only problem I had was once it locked up, but I pulled the batteries and it worked fine afterwards. I particularly like that it uses standard rechargeable NiMH AAA batteries so I know that I won't have any problems finding replacements in the future.