Difference between the xbox 360 Pro and the xbox 360 Arcade?

[notyrock]

Hello,
What is the difference between the xbox 360 Pro and the xbox 360 Arcade besides the price? I am going to buy one but i don't understand why one is cheaper than the other. And if you have any recommendations on which new to buy please comment.

[roadworker]

The most noticable difference is the storage capacity........the Elite has a harddisk of at least 120 GB while the Arcade has only a memorycard of 256 MB.
The Elite also has build-in support for most Xbox 1st generation games and comes standard with a headset and a network cable.....

[N.B.]

I am not entirely certain, but iirc you might need the HDD upgrade sooner or later anyhow if you get the cheaper xbox 360 Arcade, because Microsoft pumps out a new firmware every few weeks,
and they grow in size ... so sooner or later, things on the Arcade version will get maxed out ...