Replace warped disc rotors

ben11
ben11 Posts: 103
edited August 2012 in MTB buying advice
Morning!
Its my birthday so i figured I'd treat myself and replace the disc rotors on my voodoo hoodoo which warped pretty much as soon as i bought the bike :roll:
3 questions
1. are these any good?
http://superstar.tibolts.co.uk/product_ ... cts_id=202
2. Could I / Is it worth changing from the standard 180/160 sizes?
3. Why did they warp? can it be avoided? (other than the obvious knocks etc)

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