I agree with Art. I know you are interested in vinyl siding, but it
may be worthwhile to check out the Hardiplank. I've seen it at the
Home Depot or at Lowes (can't remember as I'm in both stores
frequently). You can take a look at it and decide.
I'm actually going to remove my newer vinyl siding (3 years) and
replace it with the Hardiplank once the addition is complete. It looks
like a more durable product and you don't have to worry about it
warping or blowing off when it gets windy outside.