All of those are great options, although I'd replace the Omni with the Jam instead. The Omni is softer than the other 3 on your list. The Jam is stiffer and has a faster base.
15 NS Ripsaw . 14 NS Proto HD . 14 NS Cobra . 13 Gnu Space Case EC2 . 2013 Salomon Pow Snake
14 Now Drive . 13 Now IPO
14 Flow Hylite