Weight is a problem, bigger screen = more weight. Unless you are prepared to sacrifice screen real estate...
Anyways I have found some possibilities
Dell XPS M1210 Range
* choose from duo processors (1.83GHz to 2.33GHz)
* choose up to 4GB ram
* choose up to 100 GB hard drive @ 7200rpm
* weight is approx 2 kilos
* prices start from $1999 delivered (online price, and of course price goes up/down depending on options selected)
Sony have a few to choose from also
Sony VAIO VGNSZ38GP
* duo processor 2.00GHz
* 1GB ram
* 120GB hard drive @ 5400rpm
* weight is approx 1.69 kilos
* price = $3700 inc GST
Sony VAIO VGNSZ34GP
* duo processor 1.83GHz
* 1GB ram
* 80GB hard drive @ 5400rpm
* weight is approx 1.85 kilos
* price = $2999 inc GST
Sony VAIO VGNFE38GP
* duo processor 2.00GHz
* 1GB ram
* 120GB hard drive @ 5400rpm
* weight is approx 2.8 kilos
* price = $2799 inc GST (notice the higher weight, but lower price)
Sony package together a good product and usually include wireless and bluetooth.
Dell Website
Sony Website
Happy shopping!!