This indeed has been done to death, a simple forums search would bring up all the help you need, that said I'll attempt to provide a brief summary.
The EMG 707 / 81/7 :
Is something which unless you have past experience of emg's, I would save till last. The reasoning for this being, if you do buy them, put them in your guitar then DON'T like them, you're going to have a hidious hole in your guitar due to the body routing. the good news is this next to never happens.
The EMG is a ubber powerfull active pickup employing a Voltage in the 2000mv range. as a result the sound is thick, and powerfull giving you
tight bass and clear trebble. the downside is, as any player who has put these into more than one guitar will tell you, EMG's sound just about the same in anything you put them in.
And before you go thinking, cool, I'll stick 'em in a bad guitar to improve the sound, Don't even bother, they'll just amplify the guitars inconsistancys.
The
Tone zone 7 :
Lovely pickup, Similar to Paf, but More foucused in the lower midrange. I feel it lacks perfect bass definition, but it's not bad if you want a darker PAF type. Scoops out the mids well too. Allen Garrow uses these in I believe 2 of his RG7s, and swears by them.
Jimmy J has a Video clip up in the mulimedia section of his tone zone 6, which is quite helpfull here.
Duncan JB 7:
Quite a heavy Pickup, but to be honest I've only played through a 6 string model on a shecter so I'm not qualified to help you there, Someone else probably will though.
Duncan Distortion:
Same as before, however, I have an Invader equiped to a pacifica, and to be honest, I seem to find tonaly all seymours sound the same.