You say you travel a lot and don't have time to study ?
I have a student who is now 14 years old.
She has to travel every day 1 and 1/2 hours to school by car, and the same amount of time back.
Thats 15 hours a week.
Her mother had decided 2 years ago that that was a fair amount of wasted time, and convinced her daughter to learn japanese.......in the car.
Result, after doing that for 2 years, she knows just about every japanese word that we use in our daily life and she can have a simple converastion too.
So, what do I want to say ?....Rocket Spanish is made up of MP3s....you can study when you travel.
All you need is an iPod or simular device
Spain is a nice country.
I have been there when I was young ( or was that in another lifetime ?? )