I suggest Logitech G35,

I just know this [url=http://www.modem3g.com/]USB modem[/url] can support Windows 2000 and Windows XP, don't know it can also support Linux. I googled, and found huawei e220 can support Linux 2.6.20 or higher include Fedora, here is a link about install huawei e220 on Linux: http://oozie.fm.interia.pl/pro/huawei-e220/ Maybe this is also useful.