jonnyjack - wow that's the exact setup i was looking at.  however if you can splurge a little more, you could get some better components for just a little more.  the NSP1 setup comes w/ 4 N24 speakers and a N-Center center channel.  check out 
www.audioreview.com on those components, the speakers are pretty good but look up the center channel, everyone says they wished they'd gotten the S-Center instead.  jandr also sell the S-center, i decided i wanted to do it right, so i upped the N24 fronts to 2 N28s.  that's 2 N28 fronts, 2 N24 rears, and an S-Center center channel.  i think it's considerably better then the default NSP1 package for not a whole lot more.  just my experience on it.
also, apparently the JBLs lack a certain bass which you need to fill up with a sub, were you planning on that as well?  i'm planning to purchase my sound system from jandr using flooz to get the 20% off, that would make it the best price avail on the web.