Difference between Curve 8300 and 8800

Hello friends~
I have a chance to purchase a curve. He has two brand new models: one being an 8300 and the other an 8800. I have a pearl through t-mobile currently and I don't know which one I want. HELP! Thank you! Also, what questions do I need to ask? I feel like I'm buying a car vs. another phone! :)

i have the t-mobile BB 8320 and absolutely love it. The wi-fi makes surfing the web so much faster!

Here's a comparison for you from RIM's site