The best thing you can do is use a very secure password for your router and a very secure encryption paraphrase for WAP2 PSK. With fifteen or more characters, upper and lower case letters numbers and special characters there isn't enough time in your lifetime for anyone do do a brute force attack on your router.
Long passwords aren't that difficult to remember if you use a sentence. "Thebrowncowjumpedoverthemoonin1955!!!"
This password would take 2.09 trillion trillion trillion centuries to guess under a massive attack of 100 trillion guesses per second so limiting guesses to three per minute isn't going to make much difference other than telling an attacker to buzz off.