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The sniper is such an archetypical character concept that it's weird that it's so hard to build one in Pathfinder. I'm running into this for a campaign I'm writing right now - one of my PCs once to be a sniper-type character.
I would definitely suggest slayer over rogue. Studied target is awesome and has no range limit. At low levels you are basically going to be a standard ranged rogue - i.e. sucking pretty hard. However, once you can save up the money for a pair of sniper goggles things start to look better. You will also want endless ammunition on your crossbow - expensive, but you are basically paying for style points. Yes, bows are stronger, but heavy crossbows are cooler. Plus you can fire a crossbow while prone, and you just aren't a sniper if you aren't firing prone.
I would also suggest a dip in shadowdancer for hide in plain sight, although slayer camouflage works just as well if you are willing to wait until 10th.
Is this an outdoorsy campaign? Because here's the thing - like any good sniper, you will need a lot of preparation. You need to be willing to split yourself from the party. Ideally, you need to find a vantage point where you can see the party, but are at least 150-200 feet away from combat. At that distance, with your high Stealth (your stealth is high, right?), the penalty on monster perception checks should be enough to keep you from being spotted. Don't forget to ask your GM for situational stealth bonuses because a) you are prone and b) you half buried yourself in dirt and leaves.
Also, carry something you can use to signal the party in a hurry. A wand of fireball with enough UMD or some kind of flare or something. Some way to say "guys, the sniper just got ambushed!"
Vital strike will probably also be your friend if you are going for the whole "one shot, one kill" feel. I would talk to your DM to see if there is any way he will let you get the gunslinger's "dead shot" deed. If he is really, really nice he might house rule that you can combine dead shot with vital strike (only adding vital strike damage once, of course), but don't count on either of those things.
What you can definitely do is pick up the Amateur Gunslinger feat to take the Bolt Ace's "Sharp Shoot" deed - combine that with a distance heavy crossbow and once per day you get to target touch AC from up to 240 feet away.
The other good news is that assassinate doesn't have a built in range limit, so with those sniper goggles you can pull it off from any range.