Is there a good quality speaker switch out there?

Hi,

I have an ASL AQ1003DT (EL-34) integrated stereo that right now I have running to two pairs of Mission speakers--one in the kitchen, and one in the library. I'd like to be able to select one pair at a time and both together if possible. Is there a quality speaker switch out there that can handle this without degrading the tone significantly? If you look at my equipment you might notice I am into tube stereo, but I don't have a very expensive system, so I would prefer the best bang for the buck option unless the better or best thing is not audiophile priced.

Thanks for your help