the omni's could be fun for the outside shows, however, i don't think they sell hypers for the c4, where they do for the lux's. hypers are great for the club shows in my opinion. one thing to note, the caps for the lux's will be around $100 a set (personally i think they're worth it if you go that option).
so i guess thats another thing to look at - superluxes with cards/omnis/hypers for the same price as c4's with just omnis/cards.