Hi there, Huntress.
Two books I recommend are by Ted Bell:
Nick of Time.
Time Pirate.
These are novels about an English boy named Nick, age 14, who lives on an island in the English Channel on the eve of WW2. He has a time machine that was created by Leonardo da Vinci and is a friend of Lord Hawke who owns a really cool castle that is a military citadel...
Very exciting books as Nick travels through time and does stuff 14 year olds ARE NOT supposed to be doing.
Except my dyslexic 9-year-old son just finished reading them. He might need something a little more challenging. They are great books however.
My just-turned-17-year-old loves just about anything from www.ThinkGeek.com. He is getting the "Khet 2.0 Laser Game" for Christmas.