I would recommend the MX 5021 Altec Lansing speakers, superb sound and they are made in mac-white aswell. I have a set for my imac myself and are very pleased
Tjeck them out at:
http://www.alteclansing.com/product_...=NO&pID=MX5021
Dont know if i am allowed to link in this forum, if not i am deeply sorry :-)