I've finally worked up the money and get-go for a new one, but after doing some basic research I quickly realised that it's been a looong time since I've done this and I know just about nothing.
Anyone got any suggestions, either in terms of specs or brands that I should look for / avoid? A successful and reliable laptop purchase will bring IW closer to fruition

My budget stretches to about $2000AUD (AUD~=USD), and I need something that will handle reasonably high end multimedia and rendering (and explosions). I think I'm going to go for a 15" screen, my last laptop was 13" and while the transportability was great, the amount of hours I spent staring at that tiny little screen was pretty ridiculous. I think any bigger than 15" pretty much defeats the purpose of a laptop.
My last laptop was a dell and I had mixed results with it. It had heavy, heavy usage for 3 years - I had some problems with it while it was under warranty. It did die after about 3 years but it made it through four continents and a hell of a lot of use. I think this time, though, I will get the extended 3-year warranty. I understand that can stretch to about $300 but it's something I think needs to be paid.
Thanks for any advice!