I agree that catchers who can hit and play defense are a rarity.  For that matter when is the last time the Brewers had a catcher that fit the bill?  B.J. Surhoff?  And he wasn't exactly known for being a defensive stalwarth.  Over the last 15 years the Brewer starting catchers have included Damian Miller, Chad Moeller, Eddie Perez, Paul Bako, Raul Casanova, Henry Blanco, Dave Nilsson, and Mike Matheny.  Even in any of these players primes, are they that much better than Estrada?  I'm not real sure, and I hate Estrada!

Off the top of my head I figured that two-thirds of the teams in baseball probably had the same complaints about their catcher as we do.  So I looked into it a little farther to see if that was the case and who would be considered an upgrade over Estrada.  For starters my qualifications were catchers under 30 years old who had an OBP greater than Johnny's last year (.700).  

Of the 30 teams in baseball, 16 had starting catchers over 30 years old.  The other fourteen are as follows (OPB in parenthesis):
Navarro, TB .642
Martinez, CLE .879
Mauer, MIN .808
Buck, KC .737
Napoli, LAA .794
Suzuki, OAK .735 (Actually Kendall started more games but I added him for comparison)
Laird, TEX .637
Ruiz, PHI .736
McCann, ATL .772
Olivo, FLA .667
Molina, STL .708
Paulino, PIT .703
Doumit, PIT .813 (was Paulino's backup but played a fair amount)
Snyder, ARI .775
Torrealba, COL .699
Bard, SD .768
Martin, LA .843

Of these 17 listed, 13 beat out Estrada's .700 OPB.  I would guess that Martinez, Mauer, Ruiz, McCann, Molina, and Martin would cost more than a mint.  Anybody else on that list that catches anyone's eye?