If you are going to have 1 SSP I would opt for a Webley Alecto.
On pump you will get about the same power as a HW40 or HW75 - Both these have the same/very similar internals.
2 pumps increases the power significantly and 3 pumps a little more - on mine 3 pumps gives about 5.2fpe.
IMO opinion the Alecto is a lot more versatile than other SSP's.