Have you checked out the classifieds here?
These or
these would be well worth considering, for example. Also, I've heard the
Philharmonic-modded Pioneers are excellent for the money. You'll have to use wall-mount clamp brackets on those, as they have no rear mounting holes.
Edit: Of all the speakers mentioned thusfar, I'd lean toward the HTD and the Def Tech, as all the others are rear-ported, which probably won't allow for proper breathing when wall mounted. Between those two, I'd go for the HTD as they'll have a more solid low end for easier blending with the sub.
One more to consider, if you can stretch your budget a bit for shipping and clamping brackets, look at the
MB Quart Alexxa. See the
AH review of them. They're a steal on closeout. In for a penny, in for a pound, right?