I'm thinking the same thing myself. It seems that batteries last about 48 months and die almost without notice, so I plan on doing a preemptive strike and replacing the one in my '09 which has about 30K miles on it now and is 3 1/2 years old.
There are a few recent good threads on Bob Is The Oil Guy about battery quality:
Duralast Platinum Battery - Bob Is The Oil Guy
Optima Batteries.... who makes them? - Bob Is The Oil Guy
Which Battery Is Better Auto-Zone Or Advance - Bob Is The Oil Guy