I have some plumbing experience. First, I have never had to use Pete the Plumber but from friends who have called him they were all very satisfied with the companys work. It sounds like a good recommendation if you can't do the work yourself.
Second, It sounds like you got two different issues. The floor being warped and water stains on the ceiling could very well be a leaking pipe. I would have to see it and investigate to be sure. Do you have a humidifier attached to your furnace. Hardwood can warp without it. Make sure you change the filter once a year in the humidifier if you do as this can scale up and cease being effective.
The sink and dishwasher backing up can be caused by a plugged pipe. This would have to be rotored out to clear the blockage. Do you have a garburator?. One common thing I noticed is that when using the garburator people don't run the water long enough afterwards to flush out the pipe. Stuff will settle in the pipe and adhere to it. Each time you use it more stuff clings on further reducing the diameter of the pipe eventually causing the sink and dishwasher to back up.
Hope this helps you. Let me know how things work out.
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