When it comes to monitor size I'm a spoiled brat

I've been using 21" displays at work for over 10 years... maybe 15 come to think of it. However... every website design tutorial I have found says to design for a site width of 800 px. Probably because I don't know what I am doing, my first page looks like crap at the native resolution that I operate at (1600 x 1200). It probably looks fine at 800 x 600 but my little 800 px width banner image looks tiny on my stuff.
Web design has changed a tad in the last 10 years.

The last time that I cared anything about HTML was over 10 years ago and I haven't kept up with style sheets and all the other super duper web design gizmos (like flash). Methinks I may have to outsource this thing to someone that knows what they are doing. Even if it is going to be tiny. Well... at least I think that it's going to be tiny... I want it to work with Exposure Manager...
I've been eying GoDaddy's web design stuff but I'm leery of buying into it and then hating it and then being stuck with it.