That's why I'm happy with the old silver sharpie. You might have to remark every 20-30 dives, but it is cheap, and when you start thinking about selling, just stop.
And to all those "I know my gear" folks:
The object isn't to be able to find your gear. The object is to stop other people from finding it, accidentally, or otherwise.
I was on a charter in the Keys, where my wetsuit matched the official "uniform" all the dive leaders had. Lo and behold, it got scooped up and taken out back, and it took some convincing to get it back. Luckily, it was marked.
Plus, I got someone else to clean my suit, always a bonus...
