First of all please let me say how much I like the reviews on cameralabs.com. In the main they are clear and I really like the video clips which seem to bring the whole thing together. The trouble is I am still confused

or perhaps just dumb
I started the search for a DSLR being convinced that what I needed was a Canon eos 400d. Then when I phoned a shop to actually have a look at one they did not have any and claimed that you get 'more for your mone' with the Nikon d40x. So I found a shop that had both and went to have a look and came home none the wiser really except that in their catalogue they also had the Sony alpha A100.
Throughout this I had been searching the web and found cameralabs.com.
In the comparison test you compare the Nikon D80, the Canon 400D, the Olympus E510 and the Sony A100 (so two of the three I was considering and one that I was not. In the Pros and cons for the Canon and the Sony we learn that an anti dust system is in place but not 100% effective (so its a pro and a con) The Olympus seems to have effective anti dust and anti shake and the anti shake is also on the Sony A100. The Nikon does not have anti dust or anti shake.
One of the problems here is I live in the sticks and I am finding it difficult to find places which have these cameras for me to hold and try.
So where does this leave me. Well cost is clearly a factor. The Olympus look the most feature rich and also seems to be a clear ish winner but although the kit lenses look good the maximum zoom seems to be 150mm and I was hoping for a couple of lenses that covered the 18-55 or 70 mm and 75-300mm ranges. To get this I seem to need to spend a stack of cash on top of the camera and original lenses (am I missing something here?) although the 4/3 focusing seems to be a problem but I am not sure why!?!??
So that leaves the Canon, the Nikon and the Sony. The next question is how much of a problem is dust? If it is a major problem then the Nikon can be discarded leaving the Canon and the Sony. The Sony is considerably cheaper and has the anti dust and anti shake built in even if it is not as effective as would perhaps be ideal. In addition it seems to have the lens range I want without braking the bank account.
Have I got the analysis right or am I being dumber than normal. Any help would be appreciated as I was hoping to buy soon.
Thanks in advance