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 LibTech TRS HP . 15 NS Snowtrooper . 13 Salomon Pow Snake
15 Now Drive . 14 Now Drive
14 Flow Hylite