Macro algae is number 1, increase surface area for pods to multiply, takes up trates and phosphates. heres some pics of a few types of what i have some arn't really good for a reef tank though. cheato is the very best and is the most common. there is probably someone near you that has some already and is willing to share.
http://www.canreef.com/vbulletin/showthread.php?t=44890
a small DSB or just some fine sand with a little bit or lots of LR. make sure if its a refuge chamber and there are pumps near by that there are good baffles that wont let sand into your pump. make sure your turnover in your fuge is good enough for the LR and LS to get good filtration (at least +10x)
other then that, i would only set up an egg crate or other sort of fragging set-ups depending on what kind of frags your main tank will mainly produce.