I'm in the same boat as jcrowl, except that four of mine are 1/9.
As far as 1/9 and heavy (75gr) bullets go, some 1/9 barrels will stabilize them just fine-and some of them won't. If you think you are going to want to use heavier defensive OTM rounds like Hornady 75gr TAP for example, a 1/7 barrel would be a sure bet. If you're going to stick to 69gr and lighter, a 1/9 would suit you just fine.
For this reason I prefer 1/7 barrels, particularly in my defensive carbines. A 1/7 barrel will work fine with 55gr ammo like XM193, but will also stabilize the heavier defensive rounds. A 1/7 barrel becomes marginal for 52gr and lighter varmint type bullets, but that's not a problem for me as I tend to favor heavier versus lighter. A 1/7 barrel with a light bullet is kind of like a 1/9 barrel with a heavy bullet-some of them work and some of them don't.