Processor Speeds on the iMacs ((2.4, 2.66, 2.8))

Heya! I need some help deciding whether the extra money is worth it for the processing speed/ bigger screen. Right now, I'm looking at either:

1. 20", Intel Core 2 Duo 2.4GHz, 2GB 800MHz DDR2 SDRAM, 250GB SATA, 8X SuperDrive, 10/100/1000, ATI Radeon 2400XT, AirPort Extreme 802.11n,Bluetooth 2.0, iSight, OS X 10.5 Leopard
((http://www.macmall.com/macmall/families/new_promo~dp~7499690~family~newimac~promo~7.asp))

2. 20", Intel Core 2 Duo 2.66GHz, 2GB 800MHz DDR2 SDRAM, 320GB SATA, 8X SuperDrive, 10/100/1000, ATI Radeon HD 2600 Pro, AirPort Extreme 802.11n, Bluetooth 2.0, iSight, OS X 10.5 Leopard
((http://www.macmall.com/macmall/families/new_promo~dp~7497734~family~newimac~promo~2.asp))

3. 24", Intel Core 2 Duo 2.8GHz, 2GB 800MHz DDR2 SDRAM, 320GB SATA, 8X SuperDrive, 10/100/1000, ATI Radeon HD 2600 Pro, AirPort Extreme 802.11n,Bluetooth 2.0, iSight, OS X 10.5 Leopard
((http://www.macmall.com/macmall/families/new_promo~dp~7497736~family~newimac~promo~3.asp))

Right now, I have an external hard drive so the hard drive size doesn't matter much... but what I'm planning on using it for is:

• Playing World of Warcraft ((Online Game))
• A little bit of video editing ((Nothing professional...))
• Web Site Editing
• Watching Videos/ Listening to Music
• Using Office for School Work and such
• Going online

I would like a fast internet speed plus something that will launch my programs somewhat quickly... if this also matters, I've been an XP user for 7 years and this is my first Mac. Thanks for the help!
~AK

P.S. - I am going to wait for the new iMacs if they're being released ((learned from browsing some of the other forums...))
Edit -- Also, is there a place you'd recommend buying from? I'd like to get all the software, hardware, and such from the same place if possible 😀

Tallest Skil said:

Stop looking at the current iMacs. Wait seven days. Buy that.

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Yes yes I know that =P but which processing speed do you think I need? That's what I really need help on... not sure if they're changing it or not.

Tallest Skil said:

Wait for them TO change. If they don't, get a 2.4. If they do, get whatever is closest to that.

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Thank you very much =D