These will surely fail, or at least one will, the
really small part of your request. But just fwiw... also, by "big" sound, are we talking lack of compression, or wide/deep soundstage? (You have VRs right? You must be talking wide/deep?)
The following are both $350 IIRC.
The Dana 630 is supposed to be wide/deep in stage. Cons Ive heard include being a bit harsh close to them, and discernably forward. Otoh, balanced, deep, clear. Great buy is the word on the street.
http://www.theaudioinsider.com/product_info.php?products_id=32
If you want them to
crank, PSB B25. However, they are quite large bookshelves, and they do not have a wide or deep soundstage. (Perhaps the one area they can improve the most). But, man, they can
crank (arguably their best attribute). GL.