adding NIC to Qube2- performance better?

Hi all;

Would you expect that I could see better network performance from my  
Qube2 if I put a NIC in my lonely expansion slot?
If so, which chipset?

I have a USB card in there now, but I never use it.

I though I would be making use of the wonderful new install CDs, at  
least the latest 4.0, over the holidays-- but I had too many  
distractions.

Thanks for thoughts-

Brian