From standpoint of conceptual progress, the n810 since its based off the n800, which was the sucessor of the 770, which was based off some Nokia IT prototypes. They were way ahead of their time (the Nokia Internet Tablets.) With its price, form factor, design, and open source concept in devices created in a corporate setting.

Now Apple isn't innovative per say, but they are innovative because they integrated many design, and GUI ideas into a single device: The iPod touch/iPhone. Apple really isn't breaking any new ground besides the integration of a capacitive touchscreen which before was only found in few consumer and industrial applications; A touch friendly interface that has been proved before with our NIT's, Windows Mobile, Pocket Pc's, and UMPC's - its just a mismash of many already known ideas of GUI interaction.

Honestly Apple's products are losing quality as they expand and reach out to more people, and ever since the Macintosh, we have to suffer depression from closed source. Maybe I shouldn't be saying this but I do suffer depression, and the idea of closed source does not help at all.

Overall, get everything, because you know what you know, thus you need to understand first hand how each of the products handels.