I find Pipex extremely reliable, but fairly expensive compared to the likes
of Tiscali. On the other hand, I've heard that Tiscali are crap so for the
sake of a few quid a month I'm staying with Pipex.

Same here (Pipex, despite what it says in my sig) - if you feel the
urge to give someone a free month for a referral, you know where to
ask ! (the group, not me specifically)

As for supporting other OSs - as someone else said, I can see no
reason why any OS can`t be supported as long as you can go via a
router (and i`d make that a *strong* recommendation too)

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