If I buy the iphone 3GS now, will I be able to update to iphone OS 4 later?

College guy

New member
I looking to buy to the iphone 3GS, but I hear the OS 4 suppose to have "multitasking". Sould I wait to buy the iphone until OS 4 is release, or should I buy now? Also, which 3GS is better, 16gb or 32gb? I have about 7 gb of music. Is 16gb enough for music and apps? I want to have enough to memory to have a functional phone, but I dont want to pay extra for memory I might not use.
 
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