The na is a great car, needs a few revs to hustle along but not in a bad way and definitely not slow. Cheap tyre, tax and fuel.
The S has more torque so can be a less revvy experience (doesn't mean it can't be revved ), definitely quicker but not life changing. Tyres are dearer, fuel consumption is higher, as is car tax (unless an IPS).
I've not driven a 400 but personally I find the styling less cohesive compared to S1 / GT 410 etc. Yes the are better on fuel and tax. Again quicker, but I get the impression its incremental rather than another league.
I did drive a 430 while it was being run in and I honestly felt the suspension was a little hard for the road and the interior didn't feel as special as mine due to the reduced number of cows that lovingly sacrificed themselves for my interior comfort. But mine is a comfy sofa of an S1 that has only been on the track once.
Try them all and see how they feel. They are all special and depreciation on older ones is glacial.
Im happy with my old comfy sofa S1