Better air efficiency for my marker

[MedevilMike]

I'm just getting back into paintball after a five year hiatus. I also know that my Spyder E99 Avant is very outdated, so I'm planning on getting a NEW 2012 Spyder Fenix. I was thinking on modifying it to make it more accurate and a helluva lot quieter. I would like to know your thoughts on the way I am going to set this up. I plan on getting a hush bolt and a spyder HI-FLO valve kit, I'm unsure of what barrel should I get? I don't wanna get too expensive.