Coffee Appreciation

any recommendations for hight st/supermarket coffee beans (or pre-ground at a push)?

When in a tight corner I've found Sainsbury's do some kind of organic kenyan whole bean thing that's not too bad.

I don't mind the M&S Kenyan beans, but I'm no expert. To me Illy and Tesco's Finest taste pretty bad.

I'd be interested to here of good value beans (either high st, supermarket or mail order). I already spend too much on coffee.