what are you looking for? studio suite looks cool, but if you're looking for invoicing and other related stuff at a much lower price - take a look at P.A.I.D.... http://www.minutiaesoftware.com/paid.htm
80 bucks - i'm very happy with it. i guess it all depends on what your needs are. i do scheduling with mac 'address book' and 'ical' then sync with my palm. PAID does invoicing, etc. works for me...