I have only had 1 .270 and it was a Remington 700 BDL. I put a Leupold Vari-X II on it and hunted with it for 5 years here in Nebraska and Wyoming.I was shooting 130gr Nolser Ballistic tips and killed everything I hit with it.The .270 is a flat shooting round that has great velocity and is perfect for eveything up to big deer (wouldnt be my first choice for Elk or Moose,but wouldnt hesitste to use it with a good bullet like the Partition).
The rifle you buy may not be what eveyone else likes,every rifle fits everyone a little different.There are many good rifles on the market today that are very accurate right out of the box.You already mentioned Tikka's,they are a very nice rifle,as well as Remington's, Savage's,Ruger's,and Browning's are all very nice but have little differences between them that some people like and some dont.Just make sure to handle as many as you can and find the one that YOU like the best,not what the salesman is pushing on you.
As far as scopes go,I dont really think anyone needs a scope bigger then 3-9 power for deer sized game.Objective lens size is a matter of personal opinion but I dont like anything bigger then a 40mm (just too big and bulky,plus you have to buy higher rings which messes with your cheek weld).
I dont think you can go wrong with a 270 and a good scope (Leupold,Burris,Nikon,etc) and a 130gr bullet.Just pick which one your gun likes the best and go hunting.
Good luck-Tim