The most accurate handgun is the CZ 75 SP-01 and it retails at around $600 - $700.
Either the SIG or S&W
A VERY good handgun- for most puposes. Durable, reliable, accurate, and powerful.
Your question can't really be answered as asked. What exact model is it, and it is new or used, and if it is used, you need to provided a very accurate description of its condition.
$489!!
It depends on the gun. A Smith and Wesson 41 is extremely accurate. A Beretta Neos, not so much.
With your pointer finger
Depends on the firearm, what you are shooting, and where you are. With a rifle, firing from a supported position, such as a benchrest is the most accurate. In the field, the prone position is most accurate. However, that does not work well if you are in waist deep grass, or duck hunting with a shotgun. With a handgun, a two handed shooting stance is most accurate, and using a support makes that better.
25-65 USD
100-350 or so
50-200
In all likelhood, one of the bolt action pistols in a rifle caliber, such as 6mm. That holds the accuracy record for a rifle, and would likely do so for a pistol.
A beratta 8040f handgun can be at least $389.95.