153 is pushing it for 200lbs I wouldn't advise it. I ride 154 on the blunted shapes wiht longer edges (think 156-8ish effective) at 175lbs and I'm pretty close to the limit, maybe a tiny smaller on park.
When it comes to one size to the next, remember that 3cm is barely an inch, so 3cm is not too much to obsess about.
All that being said even though I believe in riding fairly small on boards like the proto or cobra or evo, 200lbs or even 190 is just too big for a 153.
For all mountain 158 is gonna be best for you, 155 doable, especially if u do lose 20lbs.
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Last edited by snowklinger; 09-08-2012 at 05:15 AM.