I only use/buy/sell/recommend HP, particularily HP Business Notebooks. I don't care much for the consumer models that you get from Harvey Norman or OfficeWorks.
The HP Business Notebooks are very nice notebooks, and have some really good, well thought out accessories and innovations that you rarely see in the competitors product ranges.
ie
Docking Stations
Extended Battery Design
What's clever about the extended Battery, is that it fit's around the docking station so you can charge both Batteries while the notebook is on the Docking Station.
The extended battery above provides an extra 3 - 4 hours on Battery Life and HP also makes a super extended Battery which can provide around 10 hours of Run-Time.
The other thing I really like is that the Docking stations are the same for most of the HP Business Notebook range.
My favourite configuration for clients is a Docking Station, 19" screen, Mouse and Keyboard at home and work. All they have to do is plonk the notebook on the Docking Station and off they go.
ps I love Vista, it's far more responsive than XP and looks fantastic.
Also, only get the Dual Core Processor Models, use a lot less power and run heaps cooler than the older Processors.