I haven't had Chromes on my Special yet (I have a set of three year old Nanowebs on it that I don't want to take off because they still sound so good), but I've had them on my ceramic 5HH a couple of times and I thought they sounded great on it. That bass has an overall more aggressive tone than my Special, but they do overlap a lot. Based on my experience, I'm guessing that they'd also work well on a Special, especially if you like a stiffer feeling string (which I do).I love my cobalt flats, and they probably last long enough to warrant the price. If you don't need new strings immediately, there's always a chance that they'll randomly go on sale on Amazon or Sweetwater.
Otherwise, if you need new strings immediately and you really want them to be flats, I'd try Chromes. Look for ECB81-5. I haven't personally tried them yet, but they're on my short list of strings I want to check out next.
