I have a Tone Zone on a basswood (direct-mounted) and I don't like it that much: too dark.
I also have an Evo2 on a basswood (mounting-ring) and I am in love with it (finally found *my tone*).
I guess it's all a matter of taste!!!
Ok, let's sum this all up:
I have never played X2N nor D-Activator X. I'm sure they are awsome pickups, but I'm afraid they might have too much output. Do they sound good on clean sound?
The Tone Zone, the PAF Pro, the Evo and Evo2 and the Steve's Special are among the favourite choices between forum members.
The Evo and Evo2 are very similar, with the Evo2 having more dynamics (more responsive to picking changes) and the Evo having more output. Evo is a bit more trebly then Evo2, that is more mid-range.
The PAF Pro is a fantastic all-round pickup. It sounds great in both neck and bridge positions. It has a very clear PAF sound, with notched EQ so that the tone won't get lost through a high-gain amp and lot of processing. (It was the pickup choice for early JEMs.)
The Tone Zone is a bit more bassy. (I personally find it too bassy; PG loves it; it's all a matter of taste.) It is a very versatile pickup and it is very responsive too.
The Steve's Special has a different approach to a high output pickup, since it is both bassy and trebly, but the mids are scooped (weird approach to a Rock pickup?) However, direct-mounting Steve's Special on a basswood body compensates for this "lack" of midrange, thus, becoming a very flat pickup. (Some say it's even sterile!)
Among other popular choices are the Breed and the Fred. I have very little experience with these pickups.
The Breed is warm sounding (a bit too muddy for me and several other forum members). The Fred (as far as I can recall), is very dynamic and has a more vintage sound to it (almost a PAF Pro tweaked for bridge position).
I hope this clears you up a bit.