Taker/Angle have 3 top quality matches, but then some of their 2000 matches aren't very good and the 2002 SD match isn't great either. Its not so much about great chemistry, but rather an abundance of consistent 'very good or above' matches.
Taker/Orton is a very good shout though. I'm not as high on the series collectively and would probably rank it below a few of the pairings I posted, but its definitely a good series and I can't recall them having close to a bad match.
Taker/Edge I can see the argument for if you're an Edge fan, but I loathe the guy as a worker and would really struggle to call him 'good'. As a result I really can't get into most of their series, especially the wretched TLC match and I'm not even that great a fan of the HIAC. Like a lot of Edge matches its just too relient on props and spots for my liking, though I appreciate if any of his matches needed weapons and spots a HIAC vs Taker at Summerslam is about as appropriate as it gets.
Taker/Batista is a very good shout, although the Chairs match in 09 was pretty bad, though that's hardly their fault. Still I'm trying to think of pairings which consistently produced a high quality match in every match they contested, I appreciate its quite strict and harsh criteria and the chairs match doesn't take away from the 07 series but like Eddie/Rey WM 20 its still a minor blemish compared to Punk/Cena, Orton/Benoit & Punk/Mysterio.
Mysterio/Jericho could be another contender. Admittedly like Taker/Edge my lack of support of Jericho as a good worker means I'm lower on the series than most (I prefer Punk/Mysterio overall), but I wouldn't say any of their matches dipped below good throughout the feud so its therefore a worthy contender.
And SC, you forgot Orton/Christian. They had an awesome series of matches last year and I heard their mini-feud on Raw 05 was also good.
Meh, like I said this isn't about pairings that produced good/great matches, its about those pairings which somehow never produced anything below good whenever they were paired up. Aside from the initial title change match on Smackdown and Over The Limit (far and away the best match in the series) I don't rate the rest of the series very much: MITB was a story driven match so I appreciate why it was never going to match OTL but its still not much of a match to me. A case where the story and angle detracted to much from the match progressing. Summerslam I don't really like too much either, feels like every other WWE NHB/No DQ match where they have the usual array of weapons and elaborate spots. I've become too disensitised to that style and as a result there's very few WWE NBH/LMS or Street Fights I enjoy these days, especially post 2009 where they've become increasingly frequent and with very little difference in terms of layout, weapons and spots they all seem to blend together and make it impossible for me to really get into the match. Can't recall the last series of matches in a feud where I didn't find the LMS or Street Fight esque match to be one of the weakest.