My personal favs are the DiMarzio CrunchLab bridge and LiquiFire neck humbuckers....
What I especially like about the CrunchLab is that when playing high notes these still sound very "deep" with lots of substance and not ice-picky at all. Almost as if you´re playing tuned way down (but still in standard E).
Low-end notes are still tight and defined and open chods (even in hi-gain) sound humongous!
The LiquiFire neck pup gives you a well defined creamy liquid kinda solo/lead sound for single note playing and legato lines and just sings. Also a great pup for clean sounds.
I personally don't use any middle pups as they always tend to get in the way of my right hand....
So for chimey glassy bell-like cleans I use the inner coils of both bridge and neck pup together in parallel, done with a single 3way 4pdt switch (DiMarzio EP1111) for my 3 pup positions...power of simplicity.
With the wood composition of your SM Dlx being mostly maple and alder it makes for a very bright sounding guitar....with the wrong pups that easily gets ice-picky.....
Another pup I could recommend (but these only pop up from time to time used) is a DiMarzio Virtual Hot PAF.
Just my 2€-cents
edit: attached 2 short clips with the CrunchLab/Liquifire combo.
1st is heavy; Rhythms is MP1 Mod3.1 w/MDRT, Leads is Mesa Triaxis. Recorded through an old Behringer GI100 Ultra-G cab sim and an ESI DuaFire interface....
2nd is the Intro to Dream Theater´s The Count Of Tuscany. Cleans is the middle pos of the 3way toggle as mentioned above, Leads is CrunchLab and (later) LiquiFire. All Boogie Triaxis
Guitar on both was an Ibanez RG2620QMSP with DiMarzio CrunchLab and LiquiFire pups