high output impedance sensor with voltage output
There is no reason to use an op-amp just to buffer the input- use a non-inverting configuration, for example with a JFET input op-amp. 

If you want to use low GBW op-amps, you can just use more stages with less gain each.

The big problem may be that an input capacitance of only 10pF will have an impedance of about 100K at 150kHz, assuming a sine wave (worse if there are harmonics). There are techniques to get down way sub-pF using discrete parts and bootstrapping.

Minimizing the amplifier cost may not be ideal since cheap fast-ish op-amps tend to want dual supplies. Looking at the problem at a system level may yield a more optimal solution, but for cheap consider jellybean JFET amplifiers.