I would say start with a 5.1 BIC system. The bookshelves can put out a lot of sound without getting "dirty" sounding.
You say you don't need a receiver, do you already have a preamp on hand? Otherwise, you're going to need a receiver. Here's my proposed system:
2 pr. BIC DV62si Bookshelves from
Amazon: $241.88 shipped
1 BIC DV62CLR Center from
Amazon: $104.99 shipped
Subwoofers....
If you can opt for the $1500 budget, you should get the baddest sub you can. I would consider the Hsu
VTF-3 MK2 ($752 shipped), the SVS
PB12-ISD/V ($774 shipped), or an SVS
20-39CS Plus ($575 plus shipping) with a good outboard amp like the
Behringer EuroPower EP1500 ($249.99 shipped).
Lower Budget Options:
BIC V1220 from
X-10: $190.99 shipped (out of stock right now)
Cadence X-Sub from
Ubid: $229 shipped
And the less expensive subs from
Hsu and
SVS.
Since you have a large room, you're going to need a lot of sub to energize it and enjoy it. Obviously, some of the subwoofers I quoted would put you over budget, but I thought I'd at least throw out the options.
As for a receiver, I would say go with the Pioneer 1015TX, which is $430 shipped shipped from
J&R. You have to call their toll free number to get the nice price, but this is a good deal AND they're an authorized dealer, which means you'll get your warranty.
For a DVD player, you should consider these options (price will dictate what you get, but they're all good):
NeuNeo HVD2085 ($270 shipped)
Pioneer DV-588AS ($129.99 shipped)
Pioneer DV-578AS($109.44 shipped to 48189)
The Pioneers are more in your budget class. The DV-588AS is the newer model of the DV-578AS and has some more goodies.
Whew! That was a lot of post! Anyway, I'm sure that other people have posted a lot while I've been writing this (at work, had to actually do work today
).
Edit: Forgot about the streaming music thing. The Roku looks cool, but you might also want to consider something like a Squeezebox, reviewed
here.