Len, these fellas will give you the best deal going Multi Monitor PC Computers | Multiple/Dual Screen Setup:: Computer Planet
Check out their bundles section. You need a fairly powerful base unit for a) speed and b) to drive 4 monitors. Just have a laptop for general internet stuff. Try to plug directly into broadband rather than having wireless.
I have 4 screen set up, I got all the parts separately 3 years ago and it cost the sameish as the finished bundle price that these fellas are advertising. Haven't used them yet but will be when I upgrade my base unit after 3 years. Rough guess it will cost 1.3k in total, that really ain't bad at all, hope you weren't thinking you could do it all for about £600?!
