the higher end seeds banks of the four are sensi and serious.
the lower end are nirvana and g13
i think that robinbanks is talking about the strain g13, which is a great strain but is not the same as the seedbank that you are talking about. i have seeds from both nirvana and g13 in my room right now.
if you have the money i would go with sensi or serious. but any of those banks will grow you pot. i have heard some bad rumblings about g13 in the past, but i think they are bogus. all of my seeds have sprouted and the plants have grown fine.
if i had my choice i would order some sensi, due to all of the great choices at hand, but serious's bubblegum and kali mist are second to none. good luck