Well if you plan on using the 1020 with a new TV in the short to medium term, the HDMI input/output feature will be a must. But necessarily, the 1020 will then act as a switch (and possibly a video upconverter) more than anything else. If you pass the bitstream to the sound bar, the 1020 won't decode it at all. So make sure to buy a soundbar that can decode the formats you want (for example, the Sony model above does *not* decode Dolby True HD or DTS Master Audio), but this model does.
That's exactly what I was thinking (the 1080p upconvert was what sold me on the 1020k in the first place), which is why I noted that HDMI passthrough would be a good thing.
However, I may be able to run wires along or through the walls when I move (I'll be buying, I'm renting now). In which case, the soundbar is less important. As such, I'm not so excited to spend buckets of money on a 5.1 soundbar, at least not quite yet.
As I mentioned in my last post, I'll see if the Dialog Enhancement feature can help with my center channel issues. If it can, I'll just go with a less expensive 2.1 soundbar. Otherwise I might just wait until I move and go whole hog then.