To say that I dislike the P100 intensely would be an understatement.
As for the P90 SuperD, it's okay in its own way but it doesn't sound much like a real Super D or a real P90.
I have KentArmstrong noiseless Stealth90s in a Hagstrom; they're quite good sounding and have good hum rejection.
They are neither dark nor muffled, yet they still are a tad more polite than the real ones.
I think the real question is how important is the hum rejection to you? Nothing humbucking sounds exactly like a P90.
And IMO the traditional P90 design seems inherently more forgiving and less variable than the traditional humbucker design.
I agree with
larryguitar above: even really cheap import P90s can sound very, very good.
So unless you're gigging at large (where power is almost always iffy) or have dirty power at home, I'd get real ones for tone's sake.
Buy what you can afford. High quality P90s are a bit better, but IMO the differences aren't as pronounced as with humbuckers.
Even the cheapest Chinese P90s will sound far better than what you've got.
They'll give you that bark and bite that a Les Paul Special needs.