The .454 is going to kick a cheap pistol scope ( under $200 ) or reddot to junk in a short time...
Think Leupold, Burris and Bushnell 3200...in that order. Plan on spending close to $300 for the scope.
2x is fine for a .454 but a 2-6 or 2-7 variable makes it easier to sight in at the range. I always leave my scopes on 2 power in the woods and have successfully taken 200 yard shots with my deer pistol on 2 power.
Nothing beats a good quality reddot for up close and personal hunting situations though, they are faster to acquire the target than any scope. If you plan on spending all of your time in the brush and deep woods then a reddot might be just the thing for you.
I hunt corn and bean fields so i appreciate the magnification from the scope, even though it takes an extra second or two to get the deer in the field of view.
Don't buy cheap, you'll just end up replacing it with better quality optics later.