Gold Dot 147gr is subsonic in my Glock. From what I've read, it seems to do pretty well in self defense applications.
In order to "get your glock to run right" with subsonics and a suppressor, it shouldn't be too terribly hard to do. You'll want to wait and pass judgement AFTER you have a few rounds through the suppressor, as to break in the "booster" device. FTE's and Stovepipes are the usual complaint for a new suppressor. Once the booster is worn in, you'll find its pretty reliable.
I got a non captured guide rod and a few different weight recoil springs because I play with handloads a lot. I don't think that will be necessary with factory loads.