Yosemite,
Yes, the hammer has a safety of sorts. As you can tell, with the pin "out" you cannot strike the firing pins with the hammer. I do use mine, but it still doesn't take the place of the main safety, the one between the shooters ears!
If you forget to switch it off, and release the trigger, the hammer will fall to the pin. It's not really designed to be dry fired that way however. It's not good for the pin or the hammer, and it will mark the frame if done repeatedly. If you do forget, you will have to reopen your frame to be able to recock the hammer. Same thing goes if you forget to cock the hammer and pull the trigger, you will have to reopen the frame to be able to recock the hammer. The newer style frames don't have this "problem" (it's not really a problem or flaw, but they "improved" it in later generation frames).
As far as barrels go... that's like asking a stranger, "What kind of car should I buy?"
LOL
Welcome to the Contender!
There is no wrong answer.
A couple of important questions:
1. Do you reload/handload ammunition already? If not, are you planning/wanting to start?
Lots of wildcat cartridges running rampant for the Contender platform. Most are a handloading proposition. There are some good "factory ammo" barrels out there, but sadly, not near as many as used to be available in years past.
2. Are you planning on hunting game with it, or just target shooting?
Are we talking big game, small game, African safari or? If it's target shooting, what kind? Fun/informal, steel plates, near, far?
3. How much money you got?!
There are some wide ranges in prices on barrels and other TC accessories. Some of the used factory TC barrels can be had quite cheap (all things considered of course!), especially on this site's classified forums. I've scored some great deals here myself. The other end of the spectrum is there are some fantastic aftermarket barrels made by some barrel makers that are more artists than machinists. Some of these premium barrels are rather spendy, but the quality and accuracy of those barrels will ruin you to all other barrels! I know of several guys that shoot some Contender handgun barrels that rival and beat high-dollar custom bench rest guns.
4. Do you want handgun or rifle barrels?
Another cool thing about Contenders, you can have both. I have both carbine and handgun barrels for mine.
Good luck, sounds like we've "corrupted" another one guys! Welcome to the Contender, sounds like you've been bitten by the bug too.