I'll go first, I think the coolest guitar strap is the Vox Python...
http://www.j-guitar.com/sp/sea/data/1142/r/0023_1.jpghttp://www.korgnorthwest.com/images/VOX_Python_strap2.jpg
As far as comfort goes, I think nothing can beat just a plain ole' basic Ernie Ball strap. But when it comes to custom straps and/or designs, I think Levy's is probably my personal favorite. They have some killer stuff available, indeed.