Is it worth the extra money?

I'm finally making the move from PC to Mac. I've decided to get the 21.5 inch iMac.
My question is: should I get the upgrade from 3.06GHz to 3.33GHz and/or from 4GB RAM to 8GB RAM?
I will be doing DVD authoring, picture editing, watching movies, iTunes+iPhone ...

Thanks for your answers!

If you can afford the upgraded CPU, I would say go for it. Why not get the best you can afford? As far as the RAM goes, I would get the standard 4GB and upgrade it later yourself. You can upgrade the RAM cheaper than buying it from Apple. Check out Performance Upgrades; FireWire USB SATA Storage; Memory, more at OWC and Crucial Memory Upgrades for Macs - Apple Memory .

If the 3.33 is within your budget, do it. Only because I'm a believer in getting the most processor you can afford. Unlikely you'll notice any difference unless you, like me, sit around timing stuff to see how long it takes and shaving seconds off your work flow matter to you.

Would not personally invest in the 8 GB until I had the machine and saw how much I was using with 4 GB.