You wouldn't buy an all-in-one desktop? Yet you are happy to buy an all-in-one laptop..I don't see the logic in that.
all in one desktop
cant upgrade the monitor
cant upgrade the CPU
cant upgrade to more than 1 HDD
cant upgrade the video card
cant upgrade the cd burner to multiple
cant upgrade the ram (heatsinked ram that runs at high speeds such as DDR3 2000+ will not fit)
cant upgrade the mother board
in fact you just cant do crap with an all in one. you stuck with a high bill and an already out of date system.