The best juicer to buy for leafy greens which is also best juicer for carrots is the Champion juicer.
This juicer can handle most fruits and vegetable, even leafy greens, herbs and wheatgrass. It has an add-on attachment for the leafy greens.
It also lasts forever, and usually outlives itís warranty (10 year warranty for the Champion!). See here -http://www.best-juicer-reviews-and-ratings.com/Champion-Juicer.html