The Proto's smallest size is a 152. I'm kinda worried that may be too big for me. I'm kinda leaning towards the 150. I'm not sure if there is a big difference, that's why I am looking for help.
TBH I liked the Evo better than the Proto anyways. I say go with the Evo especially if you spend lots of time in the park (or want to spend lots of time in the park). The Proto can definitely hang, but the Evo I liked better for that sort of riding.
Otherwise, Proto 152 and you'll grow in to it. If you're done growing you can always pack on a few pounds by going on a diet consisting of french fries and malt liquor.