As a card carrying member of optics anonymous I can tell you that great optics can make a world of difference in the first and last few minutes of shooting light.
Your budget completely dictates any suggestions. All the glass I'll list I own myself and have chosen them based on my budget at the time. I have more scopes than rifles as I've upgraded to higher magnifications when I was able to afford to. If my budget was:
$1000–I'd look for a used or demo Leica ER-I or a Meopta Meostar. I have a Leica in 2-10x42. Just as clear and bright as other way costlier models and outperforms them all if the sun is glaring. Great eye box and edge distortion is non existent. Has an illuminated reticle and hash marks....honestly if your max range is 400, most deer calibers won't require much dialing at that range. Zero at 200 and hold a little high with a hash...
The Meopta is the best $1200 scope I've ever used. Glass is great, eye box is great, light weight, illuminated reticle and hashes....fine European glass that the shops in the Pacific Rim cannot come close to.
$2000- again I'd look for a demo and save enough (off retail) to get yourself into a better class of glass. Swaro z6i can be found at that price....I bought mine used, and great glass doesn't wear out. You can also get into the Leica Magnus mid magnification (2-12x). EuroOptics had several of these models marked down recently.
$3000- S&B Exos or Polar.....they are built like a Nightforce, but have the clarity and light transmission of a Swaro Z8i. They are a smidge heavy, but not as heavy as a NF. I found both as shot show demos, and they are so similar, I'm not sure why the company made them both. Either one will blow u away.
The other hi end option is the Swaro Z8i. Clearest and brightest scope I have, and light enough to use on any sort of Mtn Rifle. Doesn't have the tactical, built like a brick $h!thouse appearance of some others but man is it impressive to use.
I hope my comments help you choose. And good luck.