There shouldnt be much difference between 147 and 158gr. PRVI Partisan is the only one I know of that mfgr's 158gr ammo anyway, so you're limited on bullet selection there
Besides, most 147gr 9mm is listed at 100fps, which is subsonic, so all is well in that department.
Heres some good quality, *cheap* 147gr 9mm ammo i found while searching the net
As for the 147gr 9mm options, you'll need to check the mfg specs, but 99.9% of the factory offerings, including +P stuff, should be subsonic (at least out of pistol-length barrels).
I know that the heavier bullets are always nicer to shoot. I load 147's and 115's subsonic and like the 147's MUCH better. Same with my 45. 230's suppress so much "better" than the 185's.