Don't get the narrow bars get the wider set. It's a more natural riding position.
Beach bars are cool, but you need to check out the reach when you go lock to lock. Also consider how you prefer your hands to rest on the bars - bikini bars have you more knuckles forward and beach more angled outward.
Totally personal preference. I like the look of beach bars but like the control I get with bikini bars better. On my Heritage, I think the bikinis look better. I have seen Fatboys with beach bars and they look sweet.
It'll be a good few months before any bikinis emerge on these shores!! Ever thought you were wishing your life away?! ...and the riding season will be over in five minutes!