need a little advice

[Hooahguy]

ok so as some of you know i have a very weak internet connection
this is because i am using a neighbors wifi (out of desperation), and its pretty weak. i know its shameful but i have no choice. plus i have no way of finding out the owner b/c its the generic name for the router ("linksys") and theres a huge apartment complex right behind my house.
with the help of a friend, i found a good router. but now i need a good argument so i can convince my dad to let me get the router so i can play MP for my many games, like COD4 and AA.

heres the situation with me and my dad.
he doesnt trust me that much, since about a year ago he caught me using a neighbors wifi. when i first asked for a router, he said "i dont trust you." that was about a week ago.

now, there are 2 ways of doing this, at first glance:
1) suck up to him and earn it, but it will take a while
2) buy it and hide it, but if im caught theres huge consequences and ill lose the router.
3) make a deal with him, like if i get an A on my final exam for my summer course i get the router

and no, kicking my dad in the if he says no is NOT an option.

so any suggestions on how to argue for a router?

thanks for the help!