Hi,
here's comparision between PBC (PicBasic) and PBP (picBasic Pro)
http://melabs.com/products/comp_pro.htm

Depending where you're living, you can purchase it from the following one
http://melabs.com/purchase.htm#Distributors

You can also download a limited demo version of PBP.
http://melabs.com/pbpdemo.htm