Just adding my two cents worth, I fully agree with AVRat. Most people will be really challenged to see the difference between component and DVI/HDMI input. In fact, depending on, among other things, the screen size, you might not see the difference between HD and SD, let alone analog or digital HD.
To further add to the controversy, you might be better off by letting the TV do the scaling and upconversion. It is very likely that the TV's de-interlacers and scalers are better than the receivers (unless it is really a top-end model). Yet another matter to consider is whether the TV is capable of passing through HD input to the display. Many TV's accept HD input, then scale down to SD for further processing (eg. adding subtitles, menus etc. in another video layer, video enahncements etc.), and then finally scale up again to the target display resolution. This is yet another issue to check; will the receiver scale up to exactly the same resolution as the display? If not, then the TV will probably down-scale and then re-scale to the display.
Bottom line (IMHO) is not just to consider the specs of the receiver in terms of connectivity, but look at the whole system.