I use DR Sunbeams on my Carvin LB70 and I think they match the bass really well. It really depends on the sound and feel you are going for. The Sunbeams are fairly smooth for roundwounds and have a scooped mid sound with some growl. -KB
The Sunbeams have a fair amount (but they can still be warm), but I have heard that the DR Nickel Lo-Riders have a lot as well as some of the Warwick string lines (black and yellow labels I think). For the most growl you probably want nickel plated strings. There may be some others out there as well. -KB
The fat beams were not really "growly" at all for me when I tried them (see my DR Strings post on this page). They a good strings, but they were a little too clean sounding for my tastes. -KB
Judging by your name Metal123, I think DR Hi-Beams might be for you. Very bright, very flexible, and super growly on my Jazz Bass.
I used both D'Addario XLs and Vinci RKs ( www.wwandbw.com ) on my fretted and fretless Carvin 6's (H50N pu's) for quite a while before I switched to Elixirs. Both are nickel and both were quite satisfyingly growly.