Working on large files on local shares - LAN - at 100Mbps can be less than ideal. I'd be careful on moving a business entirely on the cloud unless you are really sure about the type of performance you are going to get.
The cloud services I'm talking about are they type where you work on the files in-browser. The office wouldn't have a file open over FTP or something, with every change they make waiting to be updated on the server side. With all modern cloud productivity suites, the changes are made locally and saved remotely in the background.
This is a law firm I'm talking about, too. I most likely wouldn't move a business like an architectural firm over to the cloud, since they're working with huge files, but a law firm is working with text documents, and given the size of the firm it's not like they're dealing with 500 page patent cases.
As to prices, while you have all sorts of ADSL lines for home claiming - and possibly offering - 50 or 60 Mbps downstream at 30-60 Euors/month, here in Italy a business class fiber optics 100Mbps symmetric data link is 3000 (three thousand) euros /month. France and Spain have similar - slightly lower - prices.
I don't know exactly what is being offered by FiOS, but what you describe sounds phenomenal.
To clarify: Verizon Fios isn't DSL. It's fiber. I don't know of any local DSL companies that can offer more than around 3-5Mbps, which is why I've been moving several people off of DSL, which just couldn't keep up. I wasn't sure if there was confusion there or you were just relaying your local DSL speeds.
Even cable internet has gotten way faster. Around here you can get 100Mbps, but it's a little more expensive at $90/month and has the limitations of cable like slowdowns during heavy traffic periods.
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