There are lot's of large scale garage 1/8 - 1/1 kit's out there you just have to be careful not to buy any recast's.
Not only does it take money out of the producers pocket but most recast's are total crap.
Don't buy anything from Taiwan, they are all recasts.
If you want to get into larger figures than I would suggest signing up on the Clubhouse Forum.
You have yo be a member to view the forum but unlike most other forums they strictly avoid recasters.
Also a lot of the members there sculpt professionally Action Figures, Collectables, etc...
Eric...