[delph]

I have the same issue, though with different letters. Laser etched keys are the only thing I've found that resist my fingers (or maybe my hand products). I still wear the paint out of those eventually, leaving only the engraving. My primary keyboard is now a CM Quick Fire Stealth. The characters are engraved on the front side of the key, so my fingers never come into contact with them. There may be other keyboards with the keys printed the same way.

For more than you ever wanted to know about keyboards, geekhack.org is also a great resource.