I'd suggest you wait for the GT 430. It won't be a gaming powerhouse like the GTX 460, but it will have all the HTPC capabilities, like the VP4 hardware decoder that offloads all H.264, VC-1 and MPEG-2 decoding to the GPU, HD audio processor that supports full HD Audio bitstreaming and HDCP compliant outputs.
Anandtech reviewed a HTPC SFF system with the GT 425M(same GF108 GPU as the GT 430 except lower clocked) and wrote briefly about the GF108 GPU so you can get an idea of what it can do.
http://www.anandtech.com/show/3954/a...tpc-reviewed/6