Support System Similar To WPMUDEV

Hi there,

I would like to know which plugin would be best to implement for a support system similar to how WPMUDEV has done. I am a developer and can customize it to my needs but first need some input on which plugin would be best for integrate with my Wordpress Multisite.

I have looked at a few of these but still don't know which one would be the best.
-BBPress
-Support System by WPMU
-WooThemes Support Press
-ThemeForest Support Press by IcarusCreative
-ThemeForest Support Des by Chris Mooney
-ThemeForest TicketRama by AM Themes

Let me know.

Thanks!