The X200 is Martin's entry level recurve. It's a decent bow. What spine arrows you'll need will depend entirely on your draw length and how smooth your release is. If you don't want to jack around with figuring out what aluminum or wood arrows you need, I'd suggest getting some 4560 (or are they 4055's???) Carbon Express Terminators. They should do the trick for you. If you draw the 'curve less than 28", you might cut the shafts a couple of inches longer than you really need.

No, the shelf does not line up with the center of the string. It's at least an inch or so above center. On stickbows, the bottom limb is always tillered slightly stronger than the top limb to accomodate the higher-than-center shooting plane.

Whether to shoot off the shelf or off an elevated rest is an argument that's been raging for at least 40 years. If I were shooting only targets, I'd go with the elevated rest. I have always gotten somewhat better accuracy and consistency with the rest.

I've busted a lot of those stick-on rests though, especially in cold weather. And remember, 'cold' where I am is like 25 degrees. For hunting, I think nothing beats shooting off the shelf for dependability.

It won't matter one whit with the X200 whether you set up with a rest or to shoot off the shelf. Your call. If it means anything to you, you can shoot vanes off the rest but not off the shelf. That's the real biggie between the two, as far as I'm concerned.