Armor: Soldier Rebel
Helmet: Tie: Helljumper Feet First (wearing now) / Noble Valor
Soldier for the pouches (hey, all those mags & 'nades gotta go somewhere), the Rebel variant for the color scheme - I have all the Soldier ones, the Rebel one I like best.
"Helljumper Feet First" - always liked the ODST helmet, like the color scheme on this one as oppossed to just Helljumper; "Noble Valor" - the Commando helmet is my favorite Reach helmet, of the 3 Noble variants I like this color scheme.
Sluagh: mainly because the Sluagh are the really bad faeries of Celtic myth (the kind of bad that involves blood & death).
On the topic of armor & helmets, I liked Reach's the best, because they could be psuedo-realistic. You could have all kinds of pouches & gear thingy's, which as a real spec-ops soldier you would need, futuristic or not. And they looked a little more "worn", as opposed to all shiny & clean.