
I consider this one of the most inexpensive and most effective anti-theft security equipment. If you cover your precious with a black cover it's less visible. If it's less visible it's safer. Plus the dust is just unbearable where I live. You wash the bike today, dust will be all over the place within the same day....A cover is cheap and serves quite a few purposes.
If you are interested, just make sure it can be secured on the motorcycle (otherwise it will fly off when the wind speed picks up). I also consider a vent at the top essential. Prevents moisture bultup and the "baloon effect". Got one off ebay for $16 shipped and I am quite happy with it.
Disc locks: I bought one with the alarm (Oxford Boss). Very loud....when you don't put your finger over the siren....if someone does, the alarm will not be audible. So much for the alarm. Also make sure you are not buying an old model with the round key. Those can be picked with a pen.

Was also thinking an Almax chain but the price is just crazy.