I forget the name but the best I've seen is a pin type disk lock that is mounted to the brake caliper. You can't hurt the bike either if you forget about it, the wheel can't move in any direction once locked. It runs about $100 and I've never seen the need for something that expensive but I do have a cheap disk lock, padlock that I use if I am heading to a shady place or out on the road alone.
2012 Victory Cross Country Tour, Sunset Red.
Parts added to make her louder, faster and more mine.
Stage 1 filter and pipes, Lloydz VFIII & ATW.
Clearwater Darla, LED GLO, emergency lights and siren.
Bushtec hitch and harness, Kompact Kamp trailer.