don't forget to bring your gear with you when you buy, can test and see if you're comfortable with it :) there have been a lot of good reviews on cs about the sirui tripods as well. check them out!
I think if you tape it, very likely it'll interfere with the lower sections of the legs. but still you can personalize the top section lah. go crazy man! put some glitter and beads also, stylomilo. :bsmilie:
In my experience, a sling bag is highly not recommended. Damn heavy bro. I've got the same setup as yours, just that I'm using a 7D. Can fit everything into a D400 Stealth Reporter. But like I said, damn heavy. Much better if you get a backpack :)
maybe you should consider not downgrading, but just geting the nex 5! two different kinds of cameras, good to have one of each to suit the occasion :dunno: