I have been kicking the idea of a 6.5 STW around myself, the STW would be the choice for speed
above all, the obvious abuse your bbl will take might be a deciding factor as the STW can be quite hard on your throat, but as Kirby posted recently (great read by the way), overbore cartridges used in the correct manner
can last much longer than most believe. If you are a speed junkie like me, why not?
Quality brass can still be had, yeah there are some extras in the reloading room, so? There is a great feeling to be had when working with a high horse power cartridge (& some frustrations!). If you have the knowledge in the reloading room... what the hey... but above all, have fun with it & enjoy one of the fastest 6.5mm's around.