Sinclair. Cry once. No other priming tool has a better feel of the primer anvil touching the bottom of the primer pocket IMHO. And don't worry about the primer /skin oil thing . You would have to put motor oil on your hands and not wash before you affected a primer. If you are still worried . Wash your hands before priming. It takes about a 1/2 hour before the skin oil comes back. Plus IF you have a primer detonate. Only ONE primer detonates ! Not possibly the whole tray.I have the K&M Primer Deluxe hand held priming tool. It's a nice tool. Tough as an anvil. Allows one to feel the primers bottoming out in the primer pockets. Mine doesn't have the dial gauge. The tool with the dial gauge doubles the cost of the K&M tool.
Here's a couple links to informative articles on hand priming tools. The Sinclair and the K&M are regarded as the creme of the crop.
K&M vs Sinclair Primer hand press - The Firing Line Forums
The Rifleman's Journal: Primers: Seating Pressure and Pre-Compression