Never bought there myself, but I heard good things about Noa computers in Nesher, near Haifa.
http://www.noacomp.co.il/
Ivory have excellent prices but there are rumors that their products and their service are, well, not first class. I used to work in a place where the very mention of the name "Ivory" would lead to a very loud argument between the pro-Ivory and anti-Ivory camps within seconds :)
