I'm not sure how many the other houses hold, but Kappa has room for 51. Mine loves living there -- the convenience to Strom, they're first stop on the morning shuttle, the stadium for games, The Vista, just everything and, obviously, the camraderie!
Have you visited the Greek Village -- it's beautiful. Here's the link to look at all the houses
http://www.sa.sc.edu/greeklife/sorhouses.htm
Hope your God Daughter gets to live in the AXO house -- it's really the frosting on the cake!