Definitely. I would value a decent sized sink over a bath any day. We made the mistake of putting a small hand wash basin in our family bathroom and it's useless.
And don't make the mistake of going for one of those ridiculous bowls that sit on top of a unit - you can't stand close enough so bending over to splash your face hurts your back. You can't beat a nice big pedestal sink with separate taps.
Don't forget to wire for a heated mirror.