My husband and I just put in new counter tops in both of our bathrooms, using the original bases that were original to the house. When the granite people came to measure, they told me that the smaller Master bath had a kitchen sink base, which was deeper than the other bathroom base.
I guess that it does take up some space that would have been nice to have widening the walk area, but as far as counter space, we don't mind it at all.
We used the same bowl on both baths. It looks great to me. If granite is not an option, Wilsonart, formica, will make the countertops. cost is by sq. ft. So measure and get an estimate.
good luck, Mary

I used a kitchen sink cabinet and recessed it into the wall 2". I didn't really need to do that except I originally had a door that swung open and was too close to the cabinet. I ended up doing a pocket door, but I decided to recess the cabinet anyway. I think the 24" would have been OK.
Donna