If you like the SMC or Netgear offerings, take a look at the Data Robotics Drobo. It's a similar product, but a bit more aesthetically pleasing. As with all NAS solutions, the price is still astronomical for what you get.

Edit: Since the Drobo is USB attached, it's more appropriately described DAS, not a true "NAS" solution. So the Drobo vs. the SMC & Netgear offerings is not a true apples to apples comparision. Sorry for any confusion. It still looks like a decent product.