HostBaby is the CDBaby's baby, and as such it already has a strong foot in all the musician's proverbial doors.
Their $20 price tag seems a bit much but they do offer the basics for building a decent website, even if the themes aren't the most hip around. Where HostBaby really shines is exactly their connection with CDbaby: you get 5 free CDBaby coupons per year, which means you can promote your music through their strong platform.
That is the main reason why HostBaby is a strong contender for musicians with music to sell, which is most.