I hunt in dense central Ontario bush, where average shots are usually around 20-30 yards. After buying and trying a few different guns, actions and calibers, I finally settled on a bolt action Tikka Battue (carbine) in 308. I couldn't be happier with my choice, thanks to an excellent thread on Tikka Battue on this website.
My 2 cents: whatever gun/action you chose, consider these points;
- Buy a Carbine. That extra inch or two really matters in dense bush;
- Buy light. That extra pound or two really matters on long walks;
- Buy synthetic (don't even think about wood);
- Pay attention to the rifles balance when carried with one hand on long walks....(really

)
- If you are buying a short, light rifle, go with the lightest caliber that you can get away with, for your type of hunt. ( A 5 pound carbine in 300 Win. Mag. ?...OUCH...

).
For sights; again after trying some ideas like red dots and low Mag. scopes, I eventually came back to the rifle's own open sights as the most practical of them all. Provided that your eyesight agrees.