Sorry, I'm not being clear really am I, and am confusing the issue.
Either the Wharfedale or Tannoy packages you mention would be excellent, but personally, I would build up a set of Tannoys - instead of having F1s all round, I would get F4s for the fronts. Because of this, I personally would miss out the sub, but you may wish to keep it in, which you could still do in your budget. Richer Sounds - F4s, £120; F1s £100; FC £50. That's 270 quid, leaving you another 400 quid to add a sub if you want to. Or you could leave it till later.
Does that make more sense? If it does, get down to Richers before they run out of F4s....