Wood choices...If you plan on leaving your table outdoors when not in use be sure to use an exterior grade wood/pressure treated/cedar/redwood. I would make a call to the local lumber yard and ask for recommendations on durability in your area. You may find better pricing there also by buying longer lengths.
If you use the pine be prepared to refinish every year. In my area pine is an interior wood. It can be used as exterior if pressure treated. You could build the structure out of pressure treated wood and use something else on the top surfaces.
I would recommend spending a little more in the beginning and have less work later on. The last thing you want is a LBGE crashing to the ground due to deteriorating wood.