The real bottomline is, if you've got the cash to spare, why not?

If you stick in EMGs into your SX, don't expect it will not sound like a Gibson+EMGs... but it will sound better than an SX+stock pickups.

And it's not like you're planning on buying crap pickups... if you later buy a new guitar, you can always swap those EMGs in.

It's a reasonable stop-gap measure until you can source the funds to buy a better guitar, IMO...

TS: I think that's the bottomest of the bottomest bottom line: get kick-@ss pickups and load em up into your SX, coz the pickups are transferable.

Later if you save up money for a new guitar, chances are it won't be an ESP Custom Shop loaded with the dream pickups of your choice. (Unless you hit the jackpot.)

Chances are, you're next guitar will be better quality, but it may not come with the pickups that you like. So you may end up swapping pickups again then.

So if you think that EMGs are going to do it for your, get em now and when your next guitar comes along, pop em in there...

Are you sure that you want the EMG-ZW set in the first place? I bought that set pretty much on a whim but some days, that "character-less" sound kinda annoys me. The EMG-81 and EMG-85 are very high output pickups, and you may find that it makes your mistakes more apparent. That's not a bad thing overall because it'll force you to clean up your technique.. don't get me wrong, I'm not knocking your technique since I've never seen/heard you play, but it's easy to sound like a train-wreck when you're playing with high-output pickups.

For RM750, you can take your pick of any 2 Seymour Duncan or Dimarzio pickups. You might want to scout around first before buying any pickups...