Yeah the Warpig is great and really versatile if you have a very bright sounding guitar. At first I recommended you the Aftermath because that plays COB/Arch Enemy style metal really well. But if you want to play stuff like Satriani, Timmons, etc. I'd go with the Nailbomb bridge.
Regarding Ceramic or Alnico, if you was using the pickup in a guitar specially for this music and you was going to use another guitar for metal: I'd get Aftermath in one and the Alnico Nailbomb in the other. The alnico provides a better soloing tone. If you were only getting a single set to use in the guitar to cover both styles, I'd get the Ceramic Nailbomb; not only is it able to get a really good tone for metal (I have one and I can play Children of Bodom style music easily) you can also lower the gain, fiddle about with ya EQ, and really get a nice singing lead tone from it capable of playing Satch and Timmons.
Regarding neck pickup it really boils down to 2 IMHO. If you want the liquid sound of John Petrucci and a pickup that plays all types of techniques in metal fluently (sweeps, fast legato and picking): get a Cold Sweat neck. If you want to go for a bit more of a Satriani ballad type tone which really sings: go for a Nailbomb neck. The Nailbomb neck is also perfectly capable of playing really heavy styles of metal when soloing as well, the Cold Sweat just pulls it off in a classier fashion.
Many people will recommend lower DC pickups for the neck for Satriani, but if you're using it for metal as well, a neck pickup from the contemporary range will give you a great balance.