Like the majority of persons, I voted for "take your best gear". My best happens to be the CV kit, but still...
If you are going in a situation where the environment will damage your gear, does it matter what you are using? If you absolutely need the shot, you will make some appropriate attempts to protect your equipment, but in the end you will still take the shot and risk ruining your camera. If you don't take the risk, why bother bringing the camera?
As for theft, what can you do? Valuable and non-valuable articles are always at risk of being stolen from your hotel room, your home, or right out of your hands, and in the end I don't believe that the material loss matters. Keep your exposed films separate, in a bag or suitcase that is less likely to be taken, and when you get home you'll still have your photographs and your memories.
I'm not a materialistic person - nor am I suggesting that you are - so I try not to get worried about physical possesions that are not essential to my survival. A good insurance policy for your gear will go a long way to salving your conscience, and protecting your wallet.
If a piece of equipment cannot be replaced due to scarcity or emotional attachment, then it has a different value that needs to be evaluated separately. In this case, I would likely be more protective of it, and may elect to leave it at home if I had a reasonable alternative.