You might want to check for WPA security (Wi-fi Protected Access). Most good 11g routers support it, and it'll add security. With normal WEP encryption, one could theoretically crack the code in a few weeks; with WPA, it's years (at the very least).
In my experience, 11g tends to connect faster, which means you won't have to wait as long for your net connection to start. My 11b router (from SMC) tends to take about a minute, which was annoying enough for me to go back to a good ol' wired network. At work, I've seen 11g routers take only a few seconds to connect.
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