Thank you all so far for your suggestions.
To respond to some of your comments (if that's at all necessary):
$250 for a book!!! That's almost one month's salary for me here!!
Seriously, though, I did notice 'Total Aikido' by Shioda and think that would be a good one, even though it is a different style, and also 'Aikido and the Dynamic Sphere' is mentioned by so many people, it seems like they either love it or hate it, so I think I will have to get it to make up my own mind about it. Ultimately i will be limited by what a given bookshop has or can order, but I'm sure those two will be easy enough to find.
Thank you all again for your suggestions, and I hope others will still post their suggestions if they havent done so yet!