I did the Batwing (70916) recently and enjoyed it.
https://www.lego.com/en-us/product/the-batwing-70916It's about $120 brand new, and you get:
harley, batman, & robin
harley's cannon
robin's go-kart
batman's batwing
the batwing is several pieces that you do independently and then connect together
the batwing has foldable wings, working cannons, a cockpit for batman, and a cargo bay for robin and his go-kart
1053 pieces
I worked on it for 3 evenings in a row. It was very relaxing.
I wish Lego would do a 50,000 piece set someday. I thought about getting the Millennium Falcon (which I think is the most pieces they've ever done or pretty near the top) but it's only like around 7,500 pieces. I chose the Batwing for its relative low-cost and high piece count.
I've outgrown Lego and am looking for a hobby that is more time-consuming. I want delayed rewards that take like 2-3 years to see a finished product. Probably going to build a Titanic replica or something soon.
