of course, if you have the option of choosing something better, like a HD2600 or geforce 8600GT, it's well worth the extra cost if you plan on doing a lot of gaming on it.
I got a dual core, 3Ghz with an 8800 myself just a few weeks ago. I am so totally amazed at what GW looks and acts like now. Imagine South Park 2.0 compared to the Transformers movie. Yup, you will like whatever upgrade you get.