Couple options pop into mind
Def Tech has closeout pricing on the now discontinued BP7006/7004, which would be near your range, and are easy loads to drive (you wouldn't really need to upgrade your receiver, at least for power...that receiver is pretty long in the tooth features wise). Built in powered woofers really lighten the load on your receiver. Bipolars require placement away from walls, so you would need the room to properly place these.
Also look at EMP towers, potitively reveiwed here at Audioholics and highly regarded for value. EMP is an ID company, but these may be worth taking a chance on unheard. A little less expensive than the DT's, even with the DT closeout pricing.
Infinity P362's are a value leader tower as well. They spec well but look a little plasticy compared to the EMP or DT's. I believe these are discontinued as well, so you may find a screamin deal on these. They are well regarded by many forum members.