When I talk to people looking to get new synths I always suggest Gladiator2 but trying to explain to them which Xpacs they should get to add the extra filters, waveforms, and FX seems to be a big turnoff for lots of people for whatever reason.
You should really sell a "full" version of Gladiator that has all the Xpacs that include filters, fx, and new waveforms. Even if it cost exactly the same as buying them separately I think it would be more appealing to prospective customers.
Either that or make a version that has all the increased functionality and features and change those Xpacs that add these features into soundsets instead.
