...ends really easy.? I've used leave-in conditioners before but it felt really greasy and heavy. Are there any leave-in's that will help reduce split-ends but not feel rather greasy/heavy???

use the garnier fructis sleek and shine system.
both me and my best friend swear by it. we use the whole
line. you should also try deep conditioning to help split ends.
just try the products. im sure they will work.

Try just putting the conditioner on the ends of the hair. I like the spray on leave in conditioner. It is totally not greasy at all. I have fine/thin hair also. I got mine at the Hairdressers. It is the best for our type of hair. Doesn't weigh it down either. See what brands your Salon has and try one. I think you will like it better than the creamy kind.