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I got the 810 primarily because it was a little bigger than the 510 I was replacing (and colour, I think). The 1000 I got later was great and it was easier to see stuff on the screen at a glance but the power button did what Edge 1000 buttons do and in the end I moved to the 830 as i couldn't afford the 1030 at the time.
So the touchscreen is worth it probably, but the extra size always felt like another good reason for the 800-series devices. That I can get a 1040 for the same price as the 840-solar makes me think the 1040 will be the one.
Probably why I should ignore the solar. I was set to get the 840 but that it's the same size as the 540 seems perverse for some reason and I can't let it go :)