Hi Caroline,
We have a mid-range Linksys wireless "N" router and get excellent range, as our computers are about 2,000 feet and several walls apart. The "N" is a newer technology and offers more range and higher speed (possibly limited though by your ISP or modem). I don't know whether you would have compatibility issues with your existing equipment.
Here's a good article.
http://www.consumersearch.com/wirele...rtant-features
Good luck!