Sounds like you have a very good setup going. The refugium is a very good idea and has many benefits. If you really load up the tank, down the line you may want to add some reactors like (carbon, nitrate, phosphate). I have a very similar light setup. You're going to want to watch your tank temp...
120 gallon reef tank, 4ft x 4ft x 8ft, up and running for 1 year. 250 watt halide, 48in T5 x 4, 30 gallon sump w/ refugium, vertex 180 protein skimmer, (carbon, nitrate, phosphate reactors), and 1280 gph blue line external pump. System is no bullshit.