which type of sink for record washing

Are you thinking of filling the sink with water and dunking the records in it? If so, don't. You'll just be transferring schmutz from one record to another. If you must use water, use the best distilled water you can find, spritz it onto the record and let it go down the drain.

Then you can choose whatever sink matches the decor!

More important to upgrade the drying rack from the $0.99 Kmart rack to the $1.29 Target one. But seriously, one with nice spacing and rods that allow you to load records on without scratching on the rack, and let any drips fall through without landing on the adjacent LP. The one I found held about 12 LPs, enough to match my patience when washing by hand with disc doctor brushes/fluid.

Sorry off topic, but if $ ever allows, spring for the VPI 16.5, much easier and more effective, IMHO.
Spencer

Metal will result in a ringing resonance that will infect your records...

Above all, make sure the sink has a drain hole of sufficient diameter to accommodate a CD-eating disposal.