I was pretty stupud with suppressor purchases early on:
Huntertown Arms Kestrel 556 - company isnt even in business anymore. Use it as a .22 suppressor mostly. If/when it fails, whatever.
Silencerco Osprey45: good suppressor, hate timing it. Doesnt work well on everything it can but due to its size, suppresses very well in both .45 and 9mm. But doesnt work well on 9mm due to its weight. I use it primarily on a Scorpion Evo.
The last suppressor I got is what Id stick with: Surefire Socom RC2. Its been a rock star. Only have one in 5.56 but when SS gets on in 7.62 back in stock, Im jumping on it.