Here's my advice:
If you want a Semi-auto get a .22 lr, never a .22 Mag. Ammo prices for the .22 Mag are around $16 for 100. You can get 700 .22 lr for that price! .22 lr is a great round and the price makes it ideal for plinking and hunting.
If you want a bolt gun for hunting, then go .22 Mag. The .22 Mag is a great round (my favorite for small game), I have a bull barrel bolt action Marlin in .22 Mag, and it shoots 1/2" groups at 50 yards, 1/4" on the good days. They just started making .22 Mag ammo with V-Max bullets (pointy plastic tip) and they fly and make the .22 Mag a viable 125 yard gun. The new bullet leave the barrel at a blazing 2200 FPS!
P.S. I just picked up a Savage .22 semi at Dunhams for $110. Great gun, cheaper than the Remington, but don't know how it compares. Accurate as I'd ever need it to be (1" at 50 yards with crap Remington ammo, I haven't tried it with anything else...). It's great practice for bigger cartridges to go out and shoot 500 rounds with a .22. It's great fun to shoot a pop can and walk it up a birm at a gun range. I try and do a lot of .22 shooting off hand, this helps me with deer hunting because most of my shots are off hand, yet I used to only target shoot from the bench.