Pes T12, it will last, they are solid, sound suppression is great, yeah they are slightly heavier than the titanium ones, but they are basically the same proportions and do a fantastic job for half the price. Muzzle flip and recoil are all but gone, you won't get the same from the really light ally mods.
Personally I wouldn't go for the scout, yes its smaller and therefore lighter, but it ain't that much lighter and the reduction in sound between them and the T12 full size is noticable.
Just my opinion, but I've tried a few. Oh, and I tried the third eye spartan, it went back a week later (they were good enough to refund fully I have to say) but they were all about snazzy looking engineering and not so much sound supression, god did that thing bark!