I too think the Flat 52s are possibly the way to go. I have two sets of the "old" Flat 50s, which I understand are the current 52s (that is right, isn't it chaps?).
I agree, they feel to me like the tele version of the Mules.
Another option, from my experience, might be Yardbirds. They don't sound so "Honky Tonk Women" as the Flat 52s, but I find I prefer their behaviour with more gain, they're less, er, "hairy" and would give more of what I'd describe as "screaming singing warm tones" - on the other hand we've got tone controls etc on our amps, so I guess I could tame the BGs nearer to that (but I just pick up the other guitar instead!)