a 9.0:1 compression ratio will be fine.
if you're looking for internals there are a variety you can check out such as: JE, Arias, Wiseco, SRP, CP and Endyn and if you're going to upgrade the pistons you might as well upgrade the rods. Eagle and Crower both make great rods. upgrade your stock clutch if you haven't already. fuel management is a must.