The 15 & 20mm axles are SUPER stiff and stout. I'll never go back to 9mm QRs, even though the new axles make it a bit of a pain to remove the front wheel.
That link to that rack is a great price! That would be a good solution too. It holds the frame instead of the front wheel.
Ahh.. I have never broken an axle (then again not too much worry about that on a roadie) so 9mm is good for me.. I have purchased a TON from nashbar, great CS and 99% great products