The M-Budget Mobile Surf subscriptions are actually very interesting, especially because they run on the Swisscom network.
However, the maximum data volume of 400 MB is a bit tight for me, I would be prepared to pay 10 for an additional data package of 1 GB (as with sunrise), or 5 for an additional 500 MB.
Unfortunately, there are no data options with the subscriptions.
Swisscom is probably still blocking something here, but a little pressure from Migros would certainly not hurt... :-)

(And then there's the annoying minimum contract period of 2 years that I mentioned earlier, which in my opinion is far too long. Especially if you don't get a subsidized cell phone...)