Hello,
IMHO, i think the best choice for your law firm is: #189 #188 #192 #86
First of all the logo is simple, so that means that its very easy to remember, it can be easily seen and recognized even when it is used on a pen. The shape of the icon is very interesting and unique, its modern and very elegant, just the way you require. Also the icon with the font gives a look of a serious/professional firm, and I think that those are one of the most important things for a law firm. It also looks great with solid colors, black and white, and you can also print it in silver color if you choose to.
Kind Regards
Ivan