Well it all depends on two things really - budget and what you want it to sound like!
I have 2 way pioneers up front stock tweeters in the dash (MK3) and infinity reference components in the rear passenger speakers just acting as my mid bass and fli tweeters in the back and to top it all off my sub in the boot with a 2 farad power cap to give that extra bass when needed as I listen to a lot of heavy dubstep and drum and bass!
And all of it is hidden beneath stock speaker grills!
And to bobbatley - why would you need to reset the hu??