Hi!

Quiero verte=I want to see you (strong desire)
Me gustaría verte=I would like to see you (more educated)
Tengo ganas de verte=I feel I want to see you (friendly)

Perhaps the translations are not the best

Think that in english you normally use much more twists to sound more educated and respectful. Spanish is more blunt and we don't twist that much the language to show courtesy.

For example, if you are in a restaurant and want a bacon burger and a salad you will say:
-"Quiero una ensalada de primero y una bacon burger de segundo por favor" And that will be enough respectful and educated (though it translates into "I want a salad first and a bacon burger following, please"). Probably in english you will use something as "I would like a bacon burger and a salad, please".

Fernando