If you really want to get another rifle, I would consider the 17HMR. I recently picked up a Savage 93R17 and it is without a doubt the most accurate out-of-the-box rimfire I own. Mine cost $220 at a local sporting goods store.
The 17HMR is a blast to shoot, but it is more expensive to shoot at 10-15 bucks per 50 rounds - depending where you shop.
I can probably shoot my reloaded 223 rounds cheaper, but really enjoy the Savage.