128-bit WEP is more than enough for a home network. In order for someone to crack your WEP key they would have to sit outside and capture enough weak keys until they have enough to decipher the WEP key. That would probably take a few days at least, even if you were downloading tons and tons of stuff constantly.
If you live in a very dense housing area, like apartments or condos, then adding something like MAC filtering might be a good idea as well. But even then, if you just change your WEP key every now and then nobody will steal your bandwidth. The only reason people make a big deal with WEP being broken is that a lot of smaller, and some larger, businesses use wireless networks. A good chunk, I'd sayd 40~60%, either have no encryption or they just use WEP. In a business environment something like a RADIUS server is something that needs to be used.
