Man I did a ton of research on these around the holidays.
If you aren't budget conscious then Rainbow, Treefrogs, etc... Are the way to go, but they are not budget friendly at all. They also only have like 2 or 3 base designs and then have a tone of variations. Point being if you don't like the base options, then your stuck with an expensive swing set that you half way like.
I ended up getting the one linked below. I wanted something really big so my kids could get their endless energy out. I couldn't find anything like this from the premier providers for less than $10k... I paid $1,900 on sale.
Again, the premier providers do provide better quality, but the one I got is pretty solid and Backyard Odyssey is easy to work with to replace anything that needs replacing in the future.
http://m.samsclub.com/ip/reno-cedar-playset-swings/prod12000133