agree with you for most part.... a lot would depend on requirements and device specifics... comments more in the nature of what to think about to get started
on biasing.... etc, my comments were based on OPs specification that the gizmo is putting out +/-50millis volts signal... actually I've made an error in the gain suggestion :). LM324 swings GND to Vcc - 1.5V... so you'd want +50mV to be amplified close to 3.5V, -50mV close to GND and 0V to about 1.7V biased to bemid in the opamp working range... ie. voltage gain around 30 to 35 (not 60 as mentioned previous post)