Ooh, let's see... The jetpack would be really cool to have, the flamethrower would be really cool (i'm a slight pyro...), the helmet would be great, I've always liked his red belt, the gloves are cool, but, hmmm...... This is a hard one. I like his whole chest-plate body-thing but it wouldn't really fit me well, and his flightsuit's cool. I never liked his shoes much though, I prefer actual boots or ankle-high shoes,
So, overall.... I'd say either the helmet or the jetpack. But those gauntlets are cool too and I'm always banging up my forearms and scratching them and getting them dirty, so they'd come in handy and they do have a lot of toys on them... Yeah, I'll take the gauntlets.