I have used a few of these including a Netgear MBR624GU, Dovado 3G MBR and a Huawei D100T.
They all work well, but are a bit dated now, there are better 3G routers now - BTW, all of the above are wireless and have ports.
The newer Netgear is an MBRN3000, and there is also a Dovado 4G.
Another good one is the Airlive 3G router.