For the last 2-3 years I colored my hair myself for the same reason. Now I'm trying to transition back to a salon since they kids are out of daycare and into public school. The ONLY home hair color that I would recommend is Frederic Fekkai
http://www.beauty.com/products/prod.asp?pid=196156&catid=141544&cmbProdBrandFilter=44841&mp=True&aid=338669&aparam=196156
It isn't easy to get in a store, you really need to order it. And it is not the easiest one to apply b/c it has a bowl and brush like the salon whereas some of the other home hair colors have gel or foam or a squeeze bottle which are easier to use. However, the biggest downside of home hair color vs. salon that I found is how much they dry out your hair. All the ordinary brands damaged my hair, no matter how gentle the box and reviews claimed they were and how closely I followed the directions. The bowl and brush is not the easiest but this product is far superior to what I've found in the stores after a lot of trial and error. Good luck!