ChrisA said:The problem is Sony is their "system" is not big. They do not offer a full line of lenses, bodies and strobes. and even worse they have NOT demonstraighted a long term commitment to interchangable parts. If they change the lens mount or discontinue the DSLR line in five years you are stuck Nikon hasa 50 year history with the "F-mount" and a public stated commitment to support the f-mount "forever". Canon is almost as good with their EOS system
When you chose a camera you are buying into s "system" and it will be quite expensive to change systems later. Good lenses will last decades and you will collect quite a few. Look into the total system offered by each company. For example you might get into sports photography or birds. Does Sony offer a 400mm f/2.8 lens? Do they have anything to compete with those 70-200 f/2.8 zoom that Nikon and Conon sell? Will Sony ever sell a pro-quality DSLR body? Think ahead 5 to 10 years.
I was also thinking about getting that new Sony A100. From the spec information, it seems to have a lot of compatible accessories due the Konica-Minolta mount spanning the past 21 years.
http://www.sony.co.uk/view/ShowProduct.action?product=DSLR-A100&site=odw_en_GB&pageType=Accesories&category=DPH+Digital+SLR
The link above shows a lot of lenses and stuff available.