Go matthew reily, he is the best author Ive ever read (i must remember to thank my firends for puting me onto him a couple of years back)
i reackon hovercar racer, ice station and temple were his best ones, contest probably would have been up there except i dont really go for sci-fi, still i couldnt put it down (i was very hungary thatnight coz i missed tea!)
I personally loved seven ancient wonders and six sacred stones, and am very impatiently awaiting five greatest worriors, to those who dont like them, fine, but dont try to disuade people from reading them
in summary, i love all his books, and highly recommend them.