Advantage of using "IF Amplifier" over traditional OP amp?
If one is implementing a notch-filter or a narrow band-pass filter, for noise performance, better use in differential mode and with dual power supply.

If this filtered output is not driving any output, we don't need high current sourcing capability.

May be something like LT1028 would suffice. (With least THD and noise levels, it may be useful to end application. http://www.linear.com/product/LT1007)