What about the string designs that sit between pure flat and pure roundwound, namely flattened round wounds (either through pressure or grinding) and coated round wounds? The number of coated strings keeps growing--Elixir, Black Diamond, DR, Ernie Ball, Aurora, D'Addario EXP, Cleartone, GHS, etc. These designs can give you various degrees of snarl, thump, and growl while going easier on the wood on the fretboard.
One of my favorite strings is the Invalid Link Removed round wound nickel string. It gives you the warmth of nickel, the snarl of the round wound, and the ease on fingers and wood of a poly coating. After six years mine finally wore out, the local supply dried up, and I've found that nothing I've tried since (Roto 88's, D'Addario Chromes) can replace them. So I'm eagerly awaiting a mail order replacement.