About the whole being worried some one is going to hack your wireless connection....
If you live in an apartment with 18 neighbors in range then yeah I would worry, if you live in the burbs with maybe 3 houses max in (crappy) range I wouldn't worry too much. Just check once in a while to see who has accessed your network and that will be never.
I use WEP and sure some one could crack it, my password is damned weak. In the years I have used WEP no one has ever even tried to hack it.
Now ask me how many times my connection has been port scanned from the Internet.... (nightly sometimes 8 times...) I recommend a full hardware firewall backed up with a good software firewall.
My Internet connection has like a billion people in range, my wireless network? Not so much.