Im with Joe too,
buy some really nice cool looking pieces, then either buy base rock or some plain bland live rock cheap.....
When i set up my tank, i ordered online,,, wasnt bad i got some big pieces, but nothing spectacular looking,,,,wish i would have just gone to the guy taking down his tank though he was chargin $5 a lb but had some interesting pieces...(I ended up trading some to him for some nice stuff at 2-1 lbs...)
bought some nice pieces at my LFS here and there....