I'll second NetGeek's opinion.
Lord knows I love the Athena series. I've got a pair of F1's, the C1 and a pair of B2's thumpin' away in the rear, all driven with a Denon 2802 and I'm happy as a clam at high tide.
but, I'm pushin' a Velo 1210 sub. The Athena subs are nice for a small room with the bookshelves but I don't think they add enough "woof" to the floorstanders to really warrant their purchase.
I'd go forthe initial Athena setup, sans the sub, for now and start lookin' at the six letters (SVS & HSU) for the (hopefully near) future.
Odds are with the two F2's thumpin' away you won't feel too, too much of a loss during the waiting period.
Oh, FWIW, I ususlly listen to music in the (gasp!) two channel mode and the F1's do quite a credible job. Music was the main driver in my speaker purchase and these beat out virtually all the more common names in hte price/ size region. Gotta love AudioAdvisor's return policy, which I didn't need.
P.S.. .with a room that size, you might want to consider stepping up the surrounds to a pair of B2's.