Currently playing around with the SRTM-30 elevation dataset (1-arcsec resolution = 30m). It does look quite nice close-up. However, sadly this is unlikely to ever make it into a download version. The amount of data is just too insane. For global coverage, I estimate that the Earth texture directory would clock in at not far shy of 1TB, and that's just not going to happen.
So feast your eyes, and be sad
So feast your eyes, and be sad