You might also want to check out Dbot5 - the AXL is around $269 at
www.wakeside.com. Depending on how thick your board is you can get the "Strap On" attachment and carry up to three boards. The regular AXL will fit up to around 2.5in thickness... the StrapOn goes up to 3.5 in or so. I have a couple of Inland Surfers as well as a Rip Curl (ocean board) that fit these perfect.
http://www.dbot5.com/racks.html