The Rena is ok but not needed if you have enough LR
and quality protein skimmer. You can then use the Rena for GAC
, etc. when needed.
What make/model PS are you getting from the lfs
? Can you post a pic of it.
What power head are you getting?
As for livestock, take Scott's advice and visit the liveaquari site. Look at the fish, check the tank size, temperment and other information and check their compatibility chart. Come up with a list of fish combinations you like and post those here for comment.