I'll be the dissenting opinion here as I don't like most stainless strings. I tried one DR set, (I don't remember which), and thought they were ok. I've tried a few different strings with my Stiletto and the best string set was a .105 set of NYXLs. I despise normal Daddarios. The hunt still continues because in 55-110 it is hard to find string sets. I like Ni strings though.
It's ok to disagree... what a boring place TalkBass would be otherwise
DR makes both stainless and nickel. I actually seem to gravitate towards DR Fat Beams (stainless) on most basses, certainly the Stingray, or DR Sunbeams (nickel) which are not a million miles away in terms of feel and sound like a little mellower Fatbeams to me that have been used a bit, which suits me as I *hate* stainless strings when I put a new set: the bright zing is a bit much, but thankfully it goes away soon leaving a really nice tone (for my liking) behind that lasts for ages. Even with the extra zing it works live very well as long as I remove a bit of the top.
I'm curious about the NYXLs, I keep hearing good things about them, but they're not particularly cheap so the couple of times I was tempted... I ended up getting my usual DRs instead. One day!
Newtone is a UK brand that I've also been hearing great things about. They're a small company but they seem to be gaining a lot of traction. They'd do any custom gauges you want as well, so it may be worth contacting them with your requirements. They do hex or round core, stainless and nickel... just ask.

