Again, the Wii looks fine on our Sony 50" - SD material looks fine on it as well (including DVD). If you live in an area with decent cable or have access to sat via D* for example, you can subscribe to +plenty+ of HD programming (or pick some some free HD network broadcasts OTA).
BTW Wezles ~ You said in another post there were sets without upscalers, and I asked for a few model examples. Never heard back from you, I was just curious about that.
I've done some auditioning of low/mid grade upscalers, and I'd say for the most part, the scalars in mid-grade/low-highend sets and most decent STBs (like the HR20 that D* uses) are very good. I've seen some $2000 products that do better, but only slightly.
There's also this outstanding suggestion that somehow providing a native HD signal via an external scalar/scan-converter somehow creates a magical HD source signal - whether it's scaled at the STB, an external DVDO box or the like, or in the set, it's still converting less data than is normally needed for the target HD resolution (ie., no free lunch).
There's no particular tech that somehow achieves better resolution as the set gets bigger. We're still talking about a finite number of lines.
SD CRT based output looks softer and has a natural anti aliasing effect. It's always been this way. SD sets have wide black dot pitch/line pitch, so it effectively fills in the gaps in the scanlines vs. filling them with scaled data (resulting in more visible "jaggies").
As the set size grows *something* has to scale up with the size - if the resolution stays fixed, the scanlines get further apart and/or get bigger (which results in less clarity). I've been watching the remastered Treks (TOS) here in the new office on an old Sony 27" Trinitron, from 10' feet it looks decent, from 4 feet you can clearly see scanlines, bleeding, interlace shimmer, etc. Make the set 60" and that would all be 2X as bad.
The information in all these TV threads is usually pretty decent, but there's always a few significant details omitted (and some fallacies introduced).
BTW, if you have an HD set, do yourself a favor and get an upscaling DVD player (or an HD-D or BD player w/ DVD upscaling) I've seen at least 3 tests of DVD to an upscaled set (or via an external upscalar) vs. an upscaling DVD player with a good chip like the Realta/Optix or Reon. The upscaling DVD players all came out ahead (the additional data available on well mastered DVD can be used to pre-decode a higher quality picture with less artifacts/macroblocking vs. a simple upconverter) - one of the new times I'd say the signal is better. Of course with an HDM player you can also score some outstanding HD sourced material