If you are just interested in playing your guitar without an amp or practice without disturbing your neighbors I would suggest using a Digi Tech
pedal. I use an RP90 for effects through my amps as well as to practice without the amp when I have to travel. Use the right headphones and you can hear your backing track and play along. Ha, and no one knows if you screw up. That's a plus.
There are a multitude of effects for many different sounds. The RP90 cost about 99 bucks but Digitech offers models starting around 50 bucks.
You can try them out at Guitar Center if you have one in your area. I tried Boss and I like the versatility and ease of using the Digitech. Buy one with a pedal if it's within your budget.