I am trying to decide between two 43" RPTV's from Sony. The KP43T90 or the KP43HT20. The price difference is $600 at my local dealer. Is the 43HT20 worth the extra $600? Are 43T90 owners happy with their choices? What are the significant differences between the two? I know one is HDTV ready and one is not. Any other 43" RPTVs to consider? All inputs are welcome.