i say, get the 60's see how you like the set up, then decide if you want a bigger center channel.. if money isn't a Huge issue, then i would say to go ahead and get a 150 along with the 60's...
i would honestly say that those sattlites would probably be fine as surrounds.. keep in mind 70% of the sounds come from the center channel, so the center is the most important speaker for movies, and HD.. sure you could buy more expensive surrounds, they may sound better, but the speakers you already have, are already paid for and in my opinion that’s a damn good price. So get your 60’s and if you can afford it get a 150, then put the pulks in the back, and use the pulk sub that you already have, im sure it will sound just fine.. I was using a JL 10” sub for a while with my 60’s and I enjoyed it just about as much as I do my system with my ep600. Granted the JL was no where near as loud and didn’t have the presence that the 600 has, but the JL also didn’t cost 1700$ or what ever it is..
