suggestions for configuring a drive

i've moved from a win platform to my first mac. i upgraded my harddrive to 640gb. i don't know which approach is best when configuring parallels vs. partitioning the drive.
i would like to run OSX and Win 7 pretty much all the time; i have about 200gb of songs that i could move into either the mac partition or win partition (or potentially keep on an external drive and have about 65 gb of win documents i need to keep on the drive.
I'd like to setup another image for ubuntu for work i'm doing but it may be used sporadically.
Would you partition the entire disk for Mac and then create the parallels images and resize them appropropriately, or would you create the partitions in boot camp, where one partition is FAT? or something else?

I would expect i would need about 200 gb for mac (w/o music) for CS5, etc; 250 for win and the remainder is dynamic.