Thinking about buying a table. There is a GC1 and GC4 for sale in my area. My question is, assuming both are in good condition and priced at 1500 for the 1 and 2000 for the 4, which one would you purchase? I did do some research and understand that the gc1 may have brunstone instead of slate and the gc4s have some sagging problems. Any input would be greatly appreciated!