See all the locks available at http://www.rbinc-sports.com: Here are some great options for Locks. The more you pay usually means the better the quality but some big name brands will spend all their money on marketing and not quality. You have to decide on where and when you park your bicycle which option is best for you.
On Guard we feel is the best bang for the buck but a bit on the heavy side. Here is a stubby hi security model
Larger model for big posts
A lighter weight less Secure On Guard large lock highly recommended for under $1000 bicycles.
Abus Locks are great- this lock is for a quick lunch while you keep an eye on your bicycle.
The lightest bicycle lock with a hi security rating this is highly recommended but not the best for hi end bicycles.
Short term cable lock- better then the Abus cable but not great.
We really like this lock because its light and hi security however you have to look for the right post to lock your bicycle up to.
This is a great option for a light weight hi security hi quality lock that works on big posts.