Re: Emgs
After having the Dave Gilmour DG-20 set in my MIM strat, I can give you the lowdown.
Advantages: they're the only things that go with EMG humbuckers, which I think are pretty nice, (had a EMG ZW set before too). I would go with an 81, because some of my favorite bands use it (John Rzeznik from the Goo Goo Dolls being one) and I think it is very articulate and outstanding with high gain. The single coils (the SAs that are in the Dave Gilmour set) work VERY well with effects and different setups. They're pretty versatile. The set I had had an EXP expander circuit and something else that could change it to emulate humbuckers. Worked pretty decently.
Disadvantages: It may be considered sterile to some. They're pretty plain to be honest. Dave no doubt loves them because it provides a perfect platform to add crazy effects to. IF YOU ARE EXPECTING THE "NATURAL" OR "TRADITIONAL" STRAT TONE, LOOK ELSEWHERE. These are not the chimey, brilliant pups that you've heard all the great vintage players use. With the right setup, I'm sure they can really work well... aka Gilmour's crazy setup. Otherwise, they will only give you decent strat tones.
I have never tried the 18v mod with either of those sets... as they were both sold (MRID has my ZW set). I think for a general versatile set, the 81-SA-SA set could perform it. However, you have to bear in mind that these are separate from the passive pups of the past. They do have a bit of a "colder" feel to them (kinda like comparing modeling amps to real tube amps). I think the 81 is the perfect metal pup and the SAs will add some cleaner, clearer flavor. Just some food for though

(I realize not everyone has the same opinions, but after trying various pup manufacturers, I feel this is pretty accurate).