Audacity is free and works on all platforms ( PC, Mac, Linux )
N-Track Studio is only $40-60. (Great sequencer.)
Magix is less than $100 and Cakewalk Home Studio just over $100.
It all depends on what works for YOU... they'll all do the job.
(and by the way, there is a $99 version of Fruity, too.... the Producer version is $150 while the Studio is $99.)