This was my series of choice too, although I don't know if it's my favorite of all time (it's tied with others), it's the one I've seen the most times (four or five times) and I can't get enough of it, it's spectacular.
As you say, the power system is fantastic, plus I thought the techniques were fantastic, especially THAT Netero technique. A 10/10 series.
oh really? amazing! Now let's go and convince Togashi to continue it :P