How to upgrade to a climate control AC??

I recently purchased a 2002 Honda Accord EX 4cyl. It came with everything I wanted and it gets great gas mileage. But, I did notice when I was test driving the V6 EX that it came with a climate control system where you could dial in a temperature and it would automatically keep the car at that temperature. I was wondering if anyone had upgraded their traditional AC controls to the Climate Control AC.

I have noticed on Ebay that you can purchase the actual control unit that fits into the dash for about $75-$100.00. Can I just switch out this unit with my unit, or is it more complicated then that? Is it possible to swith out the units at all, or should I just forget about it?

Thanks for any information on this subject

Ag_Accord