not familiar with your verizon setup but I use a Linksys cable modem with a Netgear Wireless N router along with 5-6 wireless clients on the network without any problem. The router is Wireless N but I do not have any wireless N clients even yet that can take advantage of that, but to date it has not been a problem.
Expanding gateway
I want to set up a wireless trasfer from my mac mini, which is the computer where I have downloaded most of CD's in wav format to our 2 channel system, probably via a squeezebox. I also use this mini for certain graphics that I do for my work, so it is not really a dedicated server. My verizon Actiontec gateway only has 4 wireless ports and I'm already having to switch out connections for a wireless printer. Any suggestions as to how to expand this to say 8 ports? I've found that with verizon in the past, if you use a gateway other than the one they furnish, their tech support is not as helpful.