but top end is held to those willing to shell out insane amounts of money... lets look at ferrari and lamborghini, those are what i'd like to call top end...
now you have cars that are just as fast.. for less money... say the corvette, lotus elise, and other cars such as those... now are those top end... nah.. i think not.. fast no doubt.. but not top end
top end i would say just barely starts at me, because there are so many more options left above me
but again, this is a personal opinion
top end usually means there is nothing more you can really do.. and my options.. well there's plenty... more ram, another video card, better cpu, better mobo... and it goes on