Welcome to audioholics, you will find the info you need here for sure...
The 2 components you listed will work together, but I have heard the alphas and was not impressed at all... especially for the price... And Im not a fan of the lower end yamahas..
You would be much better served with a pieced together 5.1... Most material is recorded in 5 channel not 7, 7 makes it hard to place speakers, and most people including myself prefer 5 ch vs 7...
From what you listed it looks like your budget is $1600 for speakers?
you can do MUCH better with Ascend Acoustics
Audiophile Loudspeakers and Subwoofers for Home Theater and Music - Ascend Acoustics, renowned speakers,subs,audio
depending on how large your room is? for under $1600 you can get...
a pair of cbm170se's for front left and right
a cbm340se for your center
and a pair of 200se's for your surrounds
then for a sub depending on room size a
VTF-2 MK4 Subwoofer would put you around $1476 shipped and is going to sound so much better than the psb's its not funny...
Then for an avr you can spend the money you saved on the speakers and upgrade to
Pioneer SC-1222-K 7.2-Channel Network Ready AV Receiver - Newegg.com
now that would be a real nice system....