If you keep your bunn indoors with you, he'll really become attached to you, and you'll have a much more rewarding relationship with him. He'll also live much longer if you keep him inside. I've written an article on this -
http://au.geocities.com/leaswebsite/bunnyhouserabbits.html
Have a read of these sites' recommendations for cage sizes and security -
http://exoticpets.about.com/cs/rabbits/a/rabbithomes.htm
http://exoticpets.about.com/cs/rabbits/a/rabbitcageidea.htm
http://www.rabbit.org/faq/sections/housing.html
http://www.rabbit.org/faq/sections/rabbit-proofing.html
http://www.rabbit.org/faq/sections/outdoors.html
http://www.rabbit.org/journal/4-4/pen-living.html
http://www.rabbit.org/journal/1/cage-manufacturers.html
http://www.rabbit.org/care/living-with-a-house-rabbit.html
http://au.geocities.com/leaswebsite/bunnyhouserabbits.html - my site - have a read and hope it's very helpful!