Sounds like you have a good plan. I haven't personally heard any Psi subs, but everytime I've talked with the owner I've been quite impressed with his knowledge. You could do much worse.
You've come to the right place. There should be tons of people who can help you. Speaking of Sound deadener...Secondskin is having a decent sale on Monday, 40% off door packs. I've personally used Sound Deadener Showdown cld tiles to my satisfaction, but considering the sale on Monday it may be considerably more cost effective to buy secondskin. Sound Deadener Showdown has a great informative website if you want to read up on noise cancellation.
I would worry less about other people judging your build as an SQ build and just try to make sure you are happy with it. Just my .02.