Hey Matt,
Have a look at these links, I learnt a bit from here... helps to look at other reefers setups to understand how it all fits together. If you're going to build yourself then you really need to understand pluming, over flows, flowrate and sumps\refugiums. I'm in the process of upgrading and doing alot of research.
These are just 2 links that could be of use
http://www.melevsreef.com/tanks.html
http://www.muzzys-reef.co.uk/
If you can, visit some local guys and have a look at their tank setups too...man I learn heaps then...tis when you can ask questions and understand more how things work