There are actualy hundreds or may be thousands of Guitar string makers , but i recomend you should try well known names that have a cool list of endorses , you should check out what strings your fav guitarist use and also the guage of the strings is very important and affects your tone and playing directly..
But you'll waste a long time searching for this, so I'll make a short list for you, and hope it helps ..
-Slash : 'Ernie Ball' Strings , very heavy guage as I remember it was (0.011-0.052)
-Kirk Hammett : 'Dean Markley'Strings , (.010-?) i dont remember wether the low E was 0.048 or 0.052
-James Hetfield: 'Ernie Ball' Strings , (0.010-?) not sure of the low E guage
-Dave Mustain : "D'addario" Strings, (0.010-?) not sure
-Marty Friedman: "D'addario" Strings, (0.010-?) not sure
-Ynwie Malmsteen: 'Fender' Strings , (0.008-?) he use a custom collection of light guage for treble strings and heavier guage for the bass strings.
I use D'addario Strings for my self with Regular Guage (0.010-0.046)
and i realy like their sound & i can do 8 fretts bend with them, but if you're not comfortable with the guage you should try the (0.009-0.042) for easier bending