I won't try and talk you out of a 6.5 PRC. You have that picked out. It's on my short list of next rifles.
The Tikka will have plenty of twist rate in that cartridge (1:8) Their 7mm and 30 cal stuff is slow twist. You're good to go with anything they sell in 6.5mm.
Their Magnum rifles (7mm Mag, 300 Win) have insanely short magazine COALs, so heavy bullets are shoved way in the case, so it's a double whammy there.
My advice: Do not purchase a 6.5 PRC rifle until you have something to shoot out of it. If you reload, find all of the reloading components you need and make sure they're in your possession (Brass, Dies, Bullets, Powder, Primers). If you have the cash handy, and keep your eyes open, you'll come across something priced normal. Like others have said, it's hard to come by PRC stuff. I've seen ammo listed at $5/round a few times ($100/box).
If you find a good deal on a scope, and have the cash, go for it.
*I hope the Lapua 6.5 PRC brass starts hitting the streets soon. I've had my backorder in for months now. See, I practice what I preach.