I like wireless, especially if you are working on a laptop. It's convenient to have internet access anywhere in the house and yard. Plus it gives you access to cable modem speed internet. Once you get accustomed to it, you'll be cancelling the second phone line - there's just no comparison.

If you're worried about sharing one internet connection between two computers, don't be. It's easy to setup, and you can't tell any performance degredation. My wife and I have been sharing a cable modem at home for years. First with a Netgear router, more recently we've added a Cisco wireless switch in addition. The only problem we've found is when we both attempt to use secure VPN access to our employers - only one can do so at a time. Other than that, no issues and it's fast.