What in your opinion is the most versatile "do it all" rifle? One that could be scoped for deer, but can also be used without a scope for purposes of household defense.
IMHO it is a Marlin lever action 30-30, I've yet to hear a convincing argument that has lead me to change my mind. The Marlin 336 rifle is a simple and rugged design and easy to operate and maintain. It will work well in the thick woods where shots are up close and personal, and out to 200 yards which is well beyond the distance that the majority of the deer are taken annualy. Contrary to popular belief the majority of deer harvested
nation wide, not just a partricular geographical area of the country is under 100 yards.
The Marlin can be set up with peep sights, a traditional mounted scope, or you can set it up as a scout rifle. You can pick up a good used Marlin 30-30 for next to nothing if you look around, and a new one won't break the bank either.
Remington makes a 125gr managed recoil loading which would be my first pick if the rifle was to be used indoors. Most folks that have used this ammo state that it tracks very well with 170gr loads, and no or little sight corrections are required. Ammo is all over the place for this ubiquitous cartridge both cheap and expensive. Hornady makes the famous 160gr LeverEvolution and will be offering a 140gr MonoFlex loading next year. If extra range is required these two loadings will do it with ease. Then there is the Federal 170gr Partition bullet for larger game and of course the traditional Rem, Fed, and Win offerings.
The 30-30 has been around for over 100 years for a reason, because it simply works regardless what the detractors will lead you to believe. There have been many cartridges that have come and gone that far out paced the ol' 30-30 by a good margin. However they slipped into literal cartridge oblivion while the 30-30 keeps on trucking along, there will be many more that will come and go too.
Here is another thread on why another fella shares the same opinion.
http://www.marlinowners.com/forums/index.php/topic,79408.0.html