1. Make sure the Airport and the 2Wire are operating on different frequencies. Assign the Airport Channel 1 and the 2Wire Channel 6 or 11. There are only 3 real channels in 2.4GHz, 1,6, and 11.
2. If you can move the 2Wire higher that might also help after you assign channels.
3. My 2Wire easily covers a 1200 square foot apartment. But I used my netbook to figure out which other WiFi networks were nearby and set up mine to avoid getting interference by picking a channel the others were not using.
4. The best solution would be an Airport Extreme or a Linksys E4200. These operate in both the 2.4GHz and 5GHz bands simultaneously. For the netbook you would want a WiFi USB adapter that can be set to operate in either the 2.4GHz or 5GHz bands. The Netgear WNDA3100 is one.
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www.netgear.com/home/pro ··· 100.aspx You can then put the iMac on the 5GHz and select 5GHz when you want to get the iMac's content.