I would have to recommend the CZ 527 Varmint. I have the varmint laminated, and with Black Hills 55 gr. V max ammo, it has no problem shooting 1/2" groups at 100 yards. It has a semi bull barrel so you can shoot quite a bit before it overheats, and weighs almost exactly what you want. The laminated weighs in at 7.9 lbs, according to their website and the other varming models weigh slightly less.
I also really like Tikka rifles, but when I handled their varmint model, the stock seemed light and with a bull barrel and it felt extremely barrel heavy to me. It is for this reason that I decided on the CZ.
Brandon Little