[RunItUpTheGut]

Im wanting to make sure my computer is as secure as it can possibly be with all of the personal info and such on it and i have a couple of questions someone might be able to help me with.

First off I have a wireless router. I want to make sure noone is on it at anytime besides my computer. My security says its WPA2. Is that good, or do i need to change it to one of the other security types? And is that a secure connection for sure?
Secondly, i know how to tap into my router management and see if anyone is logged onto my network or if anyone has been under DHCP clients and by looking at the security log for the network. Is this trustworthy? Can i rely on this to always pick up outside users? Im pretty sure i can but hopefully someone will shed some light and help me out with these questions.