Seeking Opinions: Wine Cellar Organization

The Breezeaire WKE3000 is humming away. The racking is anchored to the wall. On one long wall, I have racking for 320 bottles. The short wall, 96. The other long wall I have 50 half bottles, 2 racks of 48 standard bottles, 1 diamond bin, and 1 champagne rack.

My question is: What is the best organization to put the bottles in the racks.

For example: 999999 989898 979797

or 979899 979899 979899

I am leaning towards the second for 2 reasons: I can pull bottles from the top (where it is warmer) to save the lower ones, and it will be easier to put the 00 bottles in on the right side, instead of relocating bottles.

Do you plan ahead and leave a row (or column) empty for future purchases?

I think I am going to go by region, ie, German, California, France etc.

Do you occasionally reorganize your cellar and how often if you do?

We were at the local liquor store, found a bottle of Asti Spumante in a wood case. It is a 6 litre bottle (Imperial?). Does it need to be stored on it's side?

Thanks,

Walter