I'm an independent website designer who has steered my customers (mostly artists, musicians and non-profits) to pair.com for 3 years. Their basic FTP plan is inexpensive, comes with more disc space than most small sites will ever need, has generous transfer allowances and online tech help that's quick, intelligent and unfailingly polite.

I just signed on to their Advanced plan for my own business. I should have done it months ago. My only quibble is that their mail system can be a bit confusing at first for someone who's looking for an intuitive interface. Still, their online support crew answered all of my questions within a half hour and also went out of their way to make the system work for me.