My girlfriend wants the largest tent possible, I could care less personally. I like everything about the Shires Cloudburst 2. I don't think that it would be spacious enough for my lady though. She seems to really have her eyes on the Black Diamond Skylight.
Between the two the skylight is more expensive, heavier, and from what I understand more prone to water leakage. It also LOOKS like it would be less stable in high winds, though I don't have any data to confirm that.
Is there another tent that may be a happy medium between these 2 tents (for $300 or less)? The double rainbow seems like it would be more spacious than the cloudburst2 as far as headroom, but it looks like it would also be less stable than the cloudburst.

