Well, first of all, eternal happiness is an incoherent concept. If your entire conscious experience is nothing but perfect happiness layered upon perfect happiness every moment for all eternity, the whole concept of happiness loses any real meaning. This is what I hear whenever somebody asks why a benevolent God could ever let such horrible things (natural disasters, etc) happen, and the answer is surprisingly cogent: We need life to be occasionally difficult and unpleasant in order to truly appreciate what happiness and joy actually are. Now, nevermind that I think wiping out an entire city with a tidal wave before 9am is going a bit too far to illustrate that point - this argument actually makes some sort of sense. But unfortunately, it also makes just as much sense when you map it onto the afterlife. And that’s a problem with Heaven that simply goes unacknowledged by Believers. The only way Heaven could be a state of perfect, eternal happiness is if every trace of the individual - free will, personality, etc. - is stripped away. It will not be the case that Heaven isn’t ever boring or unpleasant - you will simply lose the freedom or the ability to know the difference.
If that isn’t reason enough to pass on Heaven, you might consider that, far from being advertised as a state of pure, unending bliss, it’s actually offered as a state of pure, eternal servility - endless praise and thanks for the Creator. Again, perhaps a fundamentalist view, and one that falls victim to the same trap as the gooey version of Paradise suggested above, but one that doesn’t fall victim (as much) to the loose double-talk of its more fuzzy, ingratiating cousin-theory. The fundamentalist tells you straight out that you are God’s eternal property, and you shall forever praise and thank him for that gift. Or forever burn in everlasting fire.
So to answer your question - what do I want? The glib answer is, “Make me an offer.” Given that I believe in neither heaven, nor hell, nor God, my assumption is that death is final - that my consciousness will return to the oblivion pool where it resided for nearly 14 billion years before I was born. This knowledge doesn’t make me particularly happy - but it’s an easy choice to make, given the alternatives. But if you’ve got something better A, B, or C, I’m all ears.