Tikka's are a nice rifle, 6.5 x 55 is a very nice caliber. Good combination.
i cut and pasted a previous post regarding scopes...
Scope:
Leupold: most popular, most expensive, questionable tracking, good clarity and brightness
Bushnell: less popular, much less expensive, good tracking, wonderful clarity and brightness. they are abit heavy.
Sightron: less popular, much less expensive, excellent tracking, mediocre clarity and brightness, a couple of ounces heavier than the Leupold.
Weaver: less popular but there are top ranked shooters using it, good tracking, good clarity, less expensive.
fixed vs. variable...
better brightness and clarity with fixed scopes. usually weigh less as well. less flexibility regarding magnification