Best plastic?

So, me and my friends are making a 16' long box, 12" wide. We've, made one box already but it was much smaller. We used lexan on the previous box, but we're finding it's going to cost a lot more for all the plastic we need for this one. I've found the right amount of lexan for about $110, I found HDPE for about $70, and UHMW for about $150. Will I really notice a difference if I go with HDPE over either of the more expensive plastics, or should I opt for the more expensive stuff?
 
I built 2 boxes out of hdpe and its not worth the extra cash. My friend built a box with pvc and it slides a million times better than my hdpe. I even had copping on my hdpe. You can see a picture of the boxes one of my previous threads if you like.
 
UHMW is usedd at parks and in my backyard. not a single chip and slides real nice.

read this:

http://en.wikipedia.org/wiki/Terrain_park

1230172950Ski_update__dec.20_006.jpg

1230172950Ski_update__dec.20_006.jpg
 
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