Be sure to shoot a tec riser before making your decision. I know i will never own a non-tec riser in a compound ever again.
As far as caliber, .22 is bar none the cheapest caliber to plink with. It is plentiful, and can be found in various forms. Walmart white box bulk is the best buy, but many makers produce higher quality, more consistent loads.
For rifles, the Ruger 10/22 is the most widely recognized. The 10/22 also offers the largest aftermarket options. But for out of the box accuracy my vote goes to the Marlin model 60. I absolutely love that **** gun.