Re: Savage/Stevens 200
A Stevens 200 in 223 should shoot sub-MOA out of the box with Hornady 75gr Steel Match or Federal 69gr Gold Metal Match, and will serve as a good basis for a build depending on what your wants and needs are.
Not sure what your budget is, but if you're asking about Stevens you're probably a poor broke guy like most of us! So, here are my recommendations to get started
1. Rifle (Bud's Gun Shop is probably the cheapest)
2. EGW or Weaver 20MOA scope base
3. Burris XTR rings
4. Quality "budget" optic (Bushnell 3200 10x, Weaver 3-10x, SWFA SS, Vortex Viper, etc)
5. Ammo for practice!
As funds permit, I'd first upgrade the stock (because its GARBAGE) then the trigger...though some would reverse that. For stocks the Bell & Carlson A2 Medalist and Choate A5 Tactical are popular choices in the $200 range, though you can get a Manners or McMillan of your choice. For triggers, most folks prefer either the Rifle Basix SAV-1 or the SSS Competition trigger. I have a SAV-1, like it a lot, never used a SSS trigger but I'm sure its great.
You might consider paying to join the SavageShooters forum to access the Classifieds; there are some good deals to be had there but ya gotta check often.