I am in the same dilemma as you with a bike rack. I am debating between a roof rack and a trunk rack. If you are on a budget, performance has a full roof rack for roughly $185 after shipping and a 10% off coupon.
http://www.performancebike.com/shop/...TOKEN=96911726
I do not know how reliable these mounts are. I am on the college student income so I have to go with cheaper. Does anyone have any advice on this rack or what type of rack to go for. Anyways, I hope this helps you out some. Good Luck