There are many different types of laser levels on the market and you really get what you pay for in terms of ease of use.
I use a top com laser specially designed for ceiling work and I use a stabila laser for plumbing studwork. Both lasers are excelent but are for different uses.
I use Laser Beams in Epping. They have been in business for a long time and are helpful.
http://www.laserbeams.com.au/ They have a huge range of lasers for different uses.
You may find buying a stabila laser for $280 like this one which I use for plumbing stud work.
http://www.laserlevelshop.com.au/prod2.htm
But when you come to do the ceilings hire a specialised laser for ceilings, they cost over $1500 for a poor one and over $2500 for a good one.
Hope this helps