Vista 64, whats a good office and security package?

Hi
Just finished building my new Viast 64 system and I could do with some advice on a security and Office application.

1.Security
My system is runnig with only Vista 64 firewall inplace atm so its only a mater of time befor the internet gremlins get in. From what I've read most are 32bit programs which will provide security but will not run as efficiently as a 64bit program, but there arn't many of those arround yet. I had a look on the Toms Hardware Vist security forum but traffic seemed a little light. One post mentioned a few softeware choices I was not familiar with: Avast, Panda, NOD32, AVG, Kaspersky. Now I have used Norton and McAfee products in the past. Norton Internet security (not sure which version) was provided free with my MB and I have two user accounts left over from McAfee 2006 v8.0. Would it be best to use one of these options as I have them to hand or should I consider getting something more up to date. I've read the latest Norton products are not as resource demenading as previouse versions, but if one of the alternatives is significantly better I would consider getting that.
I found this post which seemd usefull but I'm not sure that getting a 64bit security solution is the deciding factor.
http://www.vistax64.com/system-sec [...] tware.html

2. Office
From what I've read Office 2007 has a few user interface querks that irritate people who are familiar with the pervious versions. I also read this about Vista and I'm happy with that so far (used it for one week lol), so should I take these negative comments about Office 2007 with a pinch of salt? I have considered using Open Office but I'm not sure how its features and overall user experince compair with Office 2007.

Any advice would be great thanks!

And I'll comment on office. If your going to be buying a microsoft office product then yes office 07 is the best. But if you are willing to stray from microsoft branded products give open office a try. you should be able to google a good mirror to download it from and it's completely free.

Try openoffice, it's openoffice.org. I have a legit copy of office xp sitting in my house unused because I prefer open office. For antivirus and security, AVG antivirus is free, light on the system resources, and with a free firewall like zonealarm, should be adequate for your needs.

AVG is by far the best 64-bit AV so far, I've had numerous computers come in with Mcafee, NAV (Not corporate which is still the very best), Kaspersky, and NOD, all with virus'. As soon as I've installed AVG, it caught all sorts of crap NON of the others saw.

If you can find a license to NAV Corp, go that route, absolutely no bloat-ware like the normal NAV, and it works flawlessly.

Use Openoffice like everyone else says, free is better! Unless you need to work with MS Office 2k7 files, then you're stuck as nothing really opens those yet that I'm aware of.