Funny you should mention the DR's...I have been using Hi-Beams on my Series basses for awhile.  I like them.  Recently, I tried a set of DR Marcus Miller Fat-Beams, and I really love them.  They are slightly less bright than the regular Hi-Beams, and a little warmer sounding, too.  They really seem to match up weel with my Series electronics, which sure don't need help from a string to sound bright .
 
As compared to Rotosounds, Hi-Beams and Fat Beams last A LOT longer...they sound almost new for a month at least.  I really like Alembic CX strings, but they just don't hold their good tone as long as the DR's.  
 
 
YMMV, of course.

Funny you should mention the DR's...I have been using Hi-Beams on my Series basses for awhile.  I like them.  Recently, I tried a set of DR Marcus Miller Fat-Beams, and I really love them.  They are slightly less bright than the regular Hi-Beams, and a little warmer sounding, too.  They really seem to match up weel with my Series electronics, which sure don't need help from a string to sound bright .
 
As compared to Rotosounds, Hi-Beams and Fat Beams last A LOT longer...they sound almost new for a month at least.  I really like Alembic CX strings, but they just don't hold their good tone as long as the DR's.  
 
 
YMMV, of course.

I dicovered DR's a couple of years ago by buying all the stock that a music store in town had that they could'nt sell.DR low beams 50 - 110.Big strings for sure but they sounded unbelieveable on my 84' Epic.Now I won't play anything else.They last forever but I still buy them 5 sets at a time from juststrings.com.The only place I can find 50-110 low beams.Nobody in town here carries them.

84'Epic?Man,I'm missing 10 years here somewhere.I meant to write 94'.Just clearing things up a bit.