Plenty of bars to be had with the 25.4 diameter. New bars are only different in the clamp diameter. The main tubing is the same diameter as the old, so your brifters will fit fine.
Never heard of the Ritchey bars, but after a bit of googling, I have to admit that I'm skeptical that they will make much of a difference. If you ride the tops that much, you might want to think about getting a different profile bar. Also getting your bars higher up will relieve some of that strain.
If I were you, I'd look into getting a Nitto Technomic or Technomic deluxe stem to mount your old bars on in order to get your hands up.
Failing that, if you like to ride upright, you should get yourself a set of swept-back bars, or a moustache bar; some other profile that puts your torso higher.