upgrading from CAKEWALK-v6- whats reccommended?

[womoma]

Hey all,
Ive been using cakewalk 6.. yes ..6... for a couple of months now while getting into making music..
ANYWAY.. I will be getting a more updated version soon and it doesnt seem very straight forward..

These are the three options Ive been given:
CAKEWALK PRO AUDIO 9
CAKEWALK MUSIC CREATOR 2002
SONAR 3

Could somebody PLEEASE tell me which would be most reccommended, which is most powerfull, and importantly- WHAT ARE THE DIFFERENCES BETWEEN THE 3 ??
Also I do not have a VST soundcard, I have crappy onboard sound [sis 7150 or summing] will they all work on my computer. Sorry if any of my queries seem dumb Im a relative noob...
Thank you in advance

womoma