you have a couple of decent options. you could finish out the Athena system with a sub, or hold that off for a couple of months and get the rest of the pieces.
a couple of other choices:
a Polk bookshelf system (RTI-6 mains @ $380 per pair, FXI-3 surrounds @ $ 350 per pair, a CSI-3 center for $ 200, total price $ 930 and get a free 10 inch powered sub with free shipping from
www.Crutchfield.com and they also have 6 months no interest on the polks). I don't really know much about Polk sound quality, but someone like Polkfan could probably give you a good read on them,
you could also go with Polk Monitor 60 mains ($560), the CSI-3 center ($200), some Atrium 45's for surround ($ 200) for a $ 960 total. you'd still get the free sub and free shipping. the Atriums are indoor-outdoor, but that bracket makes them very easy to hang and the white usually blends in well with most walls.
crutchfield also has the Inifinity Alpha 50 floorstanders @ $ 600 per pair, the PS8 sub for $ 225 and the Alpha Center for $ 150, with a free set of Primus 150 surrounds for a total price of $ 975, also free shipping.
I have the 50's, the Alpha 37C center and the surrounds, with no sub. Some things to note... the Infinities will never be confused with Bose. They are heavy and they take up space. The Alpha Center is only about 12 pounds, but the 37C is almost 35, so it takes somthing solid to hold it. The same with the surrounds, which are a little over 8 pounds each, so I wouldn't use the el cheapo brackets from Walmart to hang them, and I would make darn sure I had the screws sunk into wood, not just sheet rock. you do need to give the Infinities a week or so to burn in. my 50's were downright harsh when I first plugged them in, but they loosened up and smoothed out after a little use. they sound great now.
the Bose can go back in the bedroom.