I had $1400 in my 30gal.
My new tank:
75gal reef ready SeaClear System II acrylic - $150 used (Integrated wet/dry compartments make a great refugium with 20lbs of rubble and chaeto, no worry about ever overflowing)
SeaClear integrated skimmer - $85
2 Power Sweep 220 PHs - $50
100lbs 6yr old coraline and star polyp encrusted LR - $100 used
260w Marineland PCs - $200
60lbs of CaribSea LS - $60
So, $645 and I have all major components. Not bad!
PS: Craigslist is the only way to buy a tank and liverock. Print out price lists off Petsmart/Petco before you shop in the store, you average a 40-50% discount.