Just a simple question for Mac users (others need not read)

Hello fellow Maccers. 
 
I just came into possession of an Airport Extreme router - for free mind you.  I have been running a Belkin until now.  
 
So, I have connected it and all is fine, but the security question is something I am interested in.  I have a DSi and I could run it with the Belkin unless I opened Windows and used the Nintendo USB (security settings didn't match the DS).  Now I just connected the DSi to the internet and all is fine and I like it that way.
 
The set-up on the Airport is asking me about security.  I live in a remote area and security really isn't an issue, but I going to set it anyway.  Which one should I choose that won't lock out the DSi and force me to use Windows?USB adapter?
WEP 40 bit 
WEP 128 bit 
WPA/WPA2 Personal 
WPA2 Personal 
 
Forgive my limited knowledge.  I know WPA is encrypted better than WEP and it seems the DSi uses both.  So which one should I use?

You should have been more specific. I use a Mac several times a week, but they aren't laptops. : P

" You should have been more specific. I use a Mac several times a week, but they aren't laptops. : P "

" I'm using WPA/WPA2 Personal, works fine for any of my wireless devices including game handhelds/consoles. Though I think the DS Lite has trouble with WPA2, not sure. "

WEP is not only weaker than WPA, but it's totally broken.  Researchers have been able to break WEP passwords in a minute.  Go with WPA if you can.

Oh man, I completely fucked up.  After I set the security I have no internet at all.  I am totally lost as to what I did. 
 
I tried many different things with settings to get it working and it all failed.  This is what happens when technology and old people meet  ^-^ 
 
I have connected the Belkin again.

" Oh man, I completely fucked up.  After I set the security I have no internet at all.  I am totally lost as to what I did.  I tried many different things with settings to get it working and it all failed.  This is what happens when technology and old people meet  ^-^  I have connected the Belkin again. "

I do know that the xbox 360 is not compatible with WPA2 : / 

" I do know that the xbox 360 is not compatible with WPA2 : /  "