Essel, in your original post you ask about a SEP.You do go on to stipulate operating on a Cof A.
Its interesting to note ,not ALL SEP,s operate on a CofA.
On a permit A/C there is no requirement for a stall warner unless the aircraft displays nasty stall habits.
I dont see much on here about permit aircraft but would urge you to consider them.
Mine cruises at 180mph tops out over 200mph climbs at 3000fpm and costs a fraction of the Robin costs
to run!
Check out the Light Aircraft Association!
Cheers John.