I have a Surface RT 32GB. And I love it. It works very well. Connecting and playing media from my existing PC's is a breeze. Office is handy... I am so glad I held out for it. And contrary to popular believe there are some decent apps for it. (A lot a crap too, but hey, don’t they all). The USB port and micro-SD slot is a big plus too.
There are still some minor tweaks they need to sort, but it will come.
Can you pop a 3G dongle in that USB port?