First of all, you look good in all of them. I'm just offering opinions in regards to the "professional work environment" you specified, where I once worked myself.
I also checked your other pics, to get a better feel for your appearance. And you look great in a coat & tie! If that's what you wear at work, or something along the lines of "business casual" (open-collar dress shirts, polos, slacks, etc) then I'd vote for the 2 middle pics, where your longer hair is parted.
I kinda like the right one, rather than the gel look, but that's a personal preference on my part. Either one would work. The top & bottom pics are too "kid just out of high school" when wearing a tie, plus as I mention below. Unless you work at Apple or Google or someplace like that, where you prolly wouldn't wear a tie, anyway.
Save the spike for nights at the local gay clubs. The Marine look at top says I just left the military or HS, and I haven't learned how to think for myself yet. It's also the gayest of the 4 styles (bet the Marines would love to hear that!), should that be an issue at your workplace. The parted gel look is the most conservative, what I see when Mormon missionaries knock on my door.