Your best bet is to find something in common that all of you like to do... and get an accessory for that activity that is the best of the best... something they probably would never get themselves because it is almost "too good."
For example, my groomsmen and I are are seriously into offshore fishing. So I got them each a $150 pair of offshore fishing pliers. I think this is the perfect example. None of them would ever have been willing to fork out that much cash for a pair of pliers, but now that they have them, not only do they LOVE and sware by them, but they will use them for the rest of their lives.
And of course I got myself a pair too. We all went out fishing the week before the wedding and I used my pliers for that trip. I let them all try out my new pliers and while they all absolutely loved them, they said there was no way they would spend so much on a pair of pliers. Safe to say they were very happy men when they open their gifts a week later at dinner.
No offense but the money clip and and watches (unless you spend a fortune) all end up in the junk drawer within a short amount of time.