We have the same deal here with FAC's for everything, if I'm right you also still have full bore pistols like here ?
The result is that most airguns here are FAC.
My TB90 runs at about 22ft/lbs with a gas ram, I'm actually thinking about winding it down to 12 as i already have the FAC Rapid.
PCP's are easier to FAC than springer's and FAC springer's can be harder to shoot, harder to silence and pretty rough on scopes, (don't buy a Webley Patriot unless you want to use open sight's , they eat scopes).
The S400 range go well in FAC if you can stretch to a PCP + charging kit.
If your going for an FAC have you considered a rimmy ?
About £350 with buy one of these
Suddenly 100 yard rabbits are on the cards, i had this out last Sunday and 1" steel spinners at 100 are not hard to hit.
I swapped the 44Mag from the CZ onto the S410 and the Leupold clone is now on the CZ, the mil dots work out really well, zero at 50 yards , first dot down is spot on at 75 yards and second dot down is 100 dead on
Springers are very hard to quieten down, PCP's respond much better but the CZ452 with a cheap PH silencer and Lapau sub's is even quieter than the S410 with AA silencer running at 12ft/lbs.