radio

Hi guys i need some advise here. I want to replace a stock radio in my wifes mazda with the new one ,but i'm not sure what to get , is there any issues i shoul concider like factory amp etc. The sound system in the car sounds great ,i like to stay that way wit the new radio. Please any adwise.

If the stock one sounds good still I would just leave it.. im sure if you go to a best buy or circit city or where ever you where thinking about getting it they will show you what you need.. and most likly if you get the radio from then they will do a free install and you dont even have to worry about it! just my 2 cents