Completely second this. I currently have a non-bento Catwa head and as much as I want to go bento I havent found something I liked yet so dont buy something if youre not 100% in love with it
If youre wanting to sample lots of skins, id think about joining groups like 7 deadly, where theres alot of group gifts, MMMs constantly (they currently have their advent calender up, but the group fee has been raised atm).
This goes more for clothing (but you can do this for your head, body and skins), but I find it quite helpful to get all the demos of an outfit I want first. Then id put it together and see if I like the end result before purchasing each piece. It saves me from just buying random things here and there and afterwards not being able to put a cohesive look together lol.