Stay away from the HERCULES card. From everything i have read it is a poor quality card compared to the other Geforce2 cards. More people are having problems with it then any other Geforce2 card.
The ram heatsinks are useless, and every reviewer has said they do nothing at all except look cool. Even the heatsink on the chip itself is said to be attached with cheap 2 sided tape that heats up and falls off. The 2D quality is also said to be the worse of any Geforce2 card.
Almost all the reviews i have read say the Hercules card is just poorly manufactured. Also, the company isn't even the same company as before. They were bought by Guillemot and they just have the rights to use the Hercules name now, so don't be fooled.
So look around at the reviews and be careful. The Leadtek and Asus 64meg cards are out now, and they are said to be much higher quality then the Hercules.