Kryptonite are so called for
Kryptonite are so called for a reason. Spend at least 10% of the bikes value on the security. The New York range are great, super strong and reliable! I am a fan of Abus locks, simple function, strength and value for money.
These also have form and design, with a nifty little carrier which mounts on the bottle cage bosses. Not too long though, should you need some slack for securing different anchors.
https://www.kryptonitelock.com/products/ProductDetail.aspx?cid=1001&scid=1000&pid=1100