One thing to really consider is, wether you want the GPS or not. GPS is only available on the 3G model. I don't really need GPS on my iPad, but would have liked to tinker with it.
Otherwise I'm pretty satisfied with my huawei e5 hotspot and a prepaid internet card. Getting real broadband in my condo woul have meant some real constructuion work (I didn't want the broadband coming out of my bathroom and then have the wiring going through different walls witin the condo). I also didn't like the terms and conditions that would have come with it.
My hotspot allows for unlimited internet access, although I have a speedreduction from 5Gigs. Speed while below 5Gigs is better than at the company I work for, and the reduced speed ain't no fun, but it's sufficient for getting my email and some basic browsing.
Also, my hotspot allows up to 5 devices being connected (this may likely change with iOs 4.3).
What I really like is, that I can take the hotspot with me and my iPad or iPod or Laptop or Psp or, or, or. I wouldn't like needing the iPad as hotspot when I want to bring my Laptop, too.
So it boils down to your personal preferences.
BUT, don't forget, wifi only iPad doesn't come with GPS (well, some basic location based stuff via determination of your wifi signal, but that's it).