RE: 7mm mag which one
Several rifles probably fit that bill. Here are the ones I'd consider in no particular order:
Ruger 77
Winchester 70
Tikka
Savage
CZ 550
Of these, the Tikka and Savage are likely to be the most accurate (but every rifle's different, so it might not work out that way). From a design preference standpoint I'd opt for the Win 70 or CZ because I like a big claw extractor and the simple, yet excellent model 70 style trigger.
I've had 5 or 6 Seven mags (I'm assuming you're talking about the 7mm Remington Magnum) and it's one of my favorite cartridges. I currently have a Sako 75 7 mag and I'd recommend it to you except I take it from your comments that you're probably not interested in a gun in this price range (around $1,000).
I left the popular Remington 700 off the above list because I just don't like them, but you might consider it also since it is your money and not mine.