Suntower,
Here's my suggestion:
Get the Special Edition/Special Edition Plus Bundle. It's a DVD set, and buy buying together, you save a little.
The extended versions of both of those libraries are active for a limited time automatically. ( 90 days, 6 months, I'm not sure) During this time you can use both standard and extended versions of both libraries. At the end of this time period, if you want to continue to use the extended versions you can then buy the license for the extended versions and activate them permanently on your computer. If you didn't use the extended versions much and don't buy them, then you've saved yourself some bucks.