I live in an Apt. complex ... no garage but a carport.
I park mine near the middle of a carport that's about 30 spaces long.
Two weeks ago my neighbors $20k Harley was stolen from the end space. (only steering locked)
(oh man the poor guy is still in serious mourning)
Then just a few days after that my other neighbors CBR600 was stolen from the other side while both my 750 and 550 sat undisturbed with just a simple 3/8" chain and cheap lock.
I've since drilled a 3/4" hole in the wall to install an extra large anchor. Now I keep one bike locked there with a 7/16" chain and an huge padlock.
I'd really like to get a 19mm chain in the near future. My research suggests that is the best security.
Something like this ... Almax Immobiliser ...
http://www.almax-security-chains.co.uk/prodtype.asp?CAT_ID=70However shipping from UK to US is

Insurance in my area for theft is an additional $300 per 6 months... That's about the cost of the chain and a good lock ...
This one looks ok for the US...
http://lockitt.com/Lockitt/product/SPMCCH/CHPS1915.htmlI've read a lot about stealing motorcycles in the last couple of weeks... to me that seems the best option.
That and having a "less desirable" mc.
Here's some good reading on the subject ...
http://www.reddit.com/r/motorcycles/comments/t5shp/ex_thief_chopshop_operator_ama/