On the security thing, if you dont want a mac then you will be using mcafee or norton or you will be hacked/infected/spyware'd to death.
A good anti-virus I have seen even in real time without hugging the system was nod32. A bit off topic hehe but eh! As for the weeblie suggestion I'm not a pro, but it has my thumbs up. If you can how ever, depending on your funds, try to get either a sli or crossfire mobo. Nvidia cards are more $$ but better at higher resolution, ati are less $$ but not as good as Nvidia, although for nwn and non hog fps related games, ati will provide you a very good quality/cost ratio.