I am an avid Mac user but have you considered getting a sub-notebook/netbook such as the Acer 1810TZ which comes with a ULV Core 2 Duo (the one I have has a 1.3 GHz processor), 4GB RAM, Bluetooth, 802.11N, a relatively full sized keyboard and an 11.6" screen? I own both an MBP 15" (i7), an iPad, and the Acer. Granted, while the Acer runs Windows 7 Home, it is adequate for playing video, iTunes, and web surfing. Battery life is approx. 6 hours.
I do find the iPad a bit restrictive but the display is gorgeous and I am hoping that OS 4 will make it a lot more usable.