I've pre-ordered the N900, but if the screen is too small for my eyes I'll need to consider something like the HTC HD2 (or preferably an Android device with the same form factor).

Maemo wins by being the most free software, but if it's unusable because of eyestrain then it doesn't help that it's the best software.

The N8x0 screen suited me much better. Give me an updated, faster N8x0 and I'd have no reason to consider any other product.

Regards,
Roger