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For cost, Squire's Kitchen for me. They can be annoying sometimes and tell you AFTER you've ordered that something is out of stock 'should we hold the whole order until it comes in or send it after xx/xx/xx when we expect delivery?' - invariably fucks me off as I'm getting something too close to a cake related deadline....
But for basics you can't really go wrong. They have just bought out their own brand of 'extra smooth' sugarpaste. May still be able to get it cheap - they were doing it half price to promote it.
They have a great shop and Annual Exhibition (in Farnham).