We have ordered our pool, but haven't begun our dig yet. Our plan consists of several umbrella sleeves around the pool. We saw some big umbrellas at Costco last night and we were wondering if those would fit our needs. I know that they have a wood pole, does that matter? I think that they also have a tilt feature. What else should we be looking for when buying our umbrellas? If you have any specific recommendations on umbrellas, it would be great if you could provide a link.