I don't think your transfer function is quite right. In fact it doesn't look like a particularly useful bandpass circuit to me at all. Are you sure that is the circuit you want? Without any positive feedback like a Sallen-Key filter circuit, or sufficient phase shift to get positive feedback, it will be a pretty lame filter. The 80dB gain cannot happen - I suspect it has to have a maximum gain less then unity.
For analysis, the presence of the input voltage divider R1 and R3 can be replaced with a single resistor and a lower Vin, thanks to Thevenin. Including the R1-R3 divider will add a lot of unnecessary complication to your equation, and you can always add the divider back in at the end and the only thing it is actually doing is reducing the gain of the filter ( as long as Vin is fed from a voltage source like an opamp output).
I could derive the transfer function if you like, but I don't think this is the circuit you actually want.