My MBP is four years old now. I spilled water into the keyboard a while ago and it just hasn't been the same. I a few of the keys don't quite work, the screen

My MBP is four years old now. I spilled water into the keyboard a while ago and it just hasn't been the same. I a few of the keys don't quite work, the screen is pretty dim, and sometimes when it wakes from sleep it doesn't properly detect the screen and defaults to 640x480. At the time it was a desktop replacement, but since then I have upgraded my desktop and am quite happy with it. I'm seriously considering an iPad as a replacement for my MBP. My primary usage of the laptop now is web browsing, email, and the occasional game, and it is a bit huge (I have a MacBook Air at work, so the old MBP feels heavy). The iPad would do all those things perfectly. For me it would be a laptop replacement.