We had a Rainbow play system. We bought it 19 years ago when there was very little competition out there in the wooden playsets. Rainbow was one of the first to break away from the old metal frame sets.
My husband did a lot of research to make sure 1) it was mechanically sound and very safe 2) that it was the type of lumber and paint/ stain that was not harmful to kids and 3) that the installation/ set-up was done well to prevent shaking and lifting, which can cause accidents. I was too busy with caring for 2 babies at the time, so I let him research his heart out. He is an engineer and this kind of thing floats his boat. He determined that Rainbow was the best out available.
You can go small, medium, large set ....whatever you want to spend. I can't remember what we paid 19 years ago, but I do remember how much out kids used it!!! They all loved it. The neighbors came over and played on it too, and I got to meet other moms in the area.
Once my husband (the engineer, remember?) figured out that the total price divided by hours used meant we paid about 75 cents per hour played on for 14 years. This made him happy.
We ended up selling ours for $200 about 5 years ago. It needed some clean-up and a new coat of stain, but still worked like a charm. The neighbors we sold it to still have it!