For 2009 a subwoofer is something I'll be looking into. The Rhythmik subwoofers are no doubt very very good subwoofers. They are just not what I am looking for. I very likely will be seeking something smaller with less extension, and less powerful. Currently I use my subwoofer very lightly, and sparingly, but still feel it is crucial for a full musical experience, and enjoyment.
For music you could try to find a Velodyne cht-8, I find it works well for music.
I have redone everything this year, I bought Revel C-30 center, L/R Revel M22's, I kept the Ascend 170se's, purchased Onkyo 805, Acurus 200x3 amp, Velodyne cht-8 sub, eD A5-350sub, kept Hsu stf-2 sub, Sony bd350 Blu-Ray. OMG, I hope my wife never finds the bills for these. I'm afraid to ask for a SOny 52" 1080 p hdtv. This fever is gonna kill me yet. UPGRADEITIS.