I'm in need to upgrade my speakers. I have been doing a little look around in stores and currently have my mind made up on KRK 8's. Speakers will only be used for listening to music, mostly hiphop and techno. Will be using Imac and a macbook pro. Are there any other speakers i should be considering ?. Currently i only have found them at sale for $499 combined. and lastly is there anything else i would need to make this system complete?