Thanks, I had a look at the Dictionary of Japanese Grammar series and they have got great reviews. They’re also quite expensive unfortunately. What the Textbooks Don’t Tell You’ by Jay Rubin as you say isn’t really for beginners but better suited to an intermediate or advanced student of Japanese.
Yes, Genki is my textbook of choice for beginners, but mostly for the reading comprehension exercises. The grammar can all be learned elsewhere (Tae Kim’s, JSPFEC etc), though Genki does a good job of creating a structured system with lots of exercises.
I found the structured reading practice worth the price, and if you wanted an offline textbook it’s the one I’d recommend. Whether or not a textbook would be right for you is another matter though, and one that only you will know the answer to. Some people do fine without them, others like them.
Wow, ok… it seems in the past few days, amazon.co.uk have received stock of JSPEC and are now selling it at £8.84! :D It says “usually dispatched within 1 – 4 weeks” but still, sounds like it could be good :D Shame it has romaji, but it’s reasonably cheap, I guess haha