It’s really up to you, i’m not sure how much the FA filter is, maybe try that first if it’s still relatively cheap.
My recommendation would be the rtlv3 dongle combined with their LNA.
(The LNA needs a bias-t to supply it with power)
Other have used the Prostick with an external LNA and it works.
I haven’t tried the LNA with the Prostick. (don’t have an external bias-t)
And compared to the Prostick alone the rtl-sdr v3 with LNA gave quite a bit better reception for me. (No matter if i used a filter in front of the prostick or not)
(Depending on the mobile signals in your area the US version of the FA filter won’t work for you. Can you make a wider scan from 700 to 1200?)
You should also check what your range is terrain-wise:
What is the Maximum Range I can Get?