I have the similar, 1.2ghz and I love it. iBooks are very light, small and cool looking! If I get sick of looking at the 12 inch screen, I simply hook it up to my 19 inch LCD and an Apple Keyboard and (bluetooth) Mighty Mouse and boom! I now have a desktop Mac! Whenever I get my accessories, their always on eBay. You can get a lot more for your money or simply a better price. For instance, I bought a $2.99 USB bluetooth adapter and a $50 Wireless Mighty Mouse that was brand new, and was still under the price direct from Apple!
So, I would most certainly check out eBay and other online vendors such as MacConnection. Hope this all helps!