A returning sniper needs some help on find a gun

Well, after about 5 Months of rolling with the main squad, I would like to return sniping, but I have run into a problem, I don't have a sniper rifle....And I need some help find one. I have some requirement that it must meet.

1. Must be US Based (Rem. 700 style, not L96)
2. Gas is prefered, spring is ok.
3. Has to be reasonably priced, ($100 range, can go up to $150)
4. I would love to be able to do some Visual Modifications (Maybe change the stock[noun not the adjective] configuations, in other words make it look good.)

I am looking for suggestions on a new gun.
I would truly appreciate your help.

p.s.- I had a BAR-10 Before, it was ok, but I would like something different