Ash HN: Alternatives to YubiKey NEO-n?

I'm looking for a OpenPGP compatible USB-token with a button you must press for each signature generated.

I'm currently using a OpenPGP SmartCard and a USB SmartCard-reader with a PIN-pad, but it's too big to carry around.

I've just purchased a YubiKey NEO-n, but it turns out the key button is only a on/off button, so an intruder with access to your computer could easily generate an extra signature just before you turn it off.