I realize this is mainly a personal decision, but it is hard to picture what the actual size difference is! I am definitely going with an oval AGP with a 7' deep end, probably either 18x33 or 18x40. Either will fit in my yard and there is not a huge price difference. We are just a family of 3, but I am sure my daughter will want to have friends over and we may want to have (small) parties at the pool. Any idea how many people can comfortably swim/play in each of these sizes? Is the 18x33 too short for a deep end?