Both are good in the price range. By narrowing your choices down to these two, does that mean thru research or by listening to them both? If the former, then I'd suggest trying to audition both and seeing which you like. If you're in a situation where you must buy "sound unheard" due to lack of local retailers, etc., then I'd say either would serve you well. I suppose I'd give the nod to the PSBs, although they sound a little "dark" for my tastes. The Athena's have sounded a tad bright in the demos I've heard, but those were in very live rooms and driven by a Yammie receiver, which probably exacerbated the problems. (Most of the times I've heard the Image towers they were driven by a NAD amp, so it's possible the combination of the two might be responsible for the minor rolloff of highs).
The PSBs have a bit better bass & a smoother midrange, IMO. But unless you're getting an exceptional deal on 'em, the 6t is a bit more expensive than the Athena. I think the 4t/5t would be a bit closer, pricewise.
To sum up, if I was choosing between just those two, I guess I'd take the PSBs.