Stick to your budget, and get something that fits.  I had an over and under that fitted perfect and in my lack of wisdom I changed it for a semi auto that shoots high.  I now need at least 2 shots to hit anything, where as if I still had the over and under 1 shot would do, 
  
What I am trying to say is, get what fits and feels right, stick with it 
  
Cheers Luke