I think that you have "painted" yourself right into a corner. You have an excellent HDTV and a very good audio receiver. You probably have spent $5300 or more, thus far. It would be a shame to skimp on the speakers considering what you have already spent and how close you are to a really good HT system.

I think that I would wait on the sub and buy a good center.

The Rat. M80s, VP-150, QS8s, SVS PC 20-39+, OPPO, Onkyo 703s, Harmony 880 Sony 60" SXRD HDTV