BikeNOW is an excellent store offering a huge range of products ranging from bikes of all descriptions to all the paraphernalia that goes along with cycling. The staff there are very knowledgeable about their products and about cycling in general, and they are all very agreeable. The prices aren't cheap - nothing bike related ever seems to be - but they aren't over the top and they have sales from time to time that give you good discounts.
Parking is a bit of an issue, given the location, but if you are a cyclist its worth making the effort to visit them.