It sounds like you need a good french drain system. Since you are handy with the mitre saw, you could probably even install it yourself. French drains rule, it solved a huge problem I had with my last house. Basically exactly as you described...3 stories built into a hillside, main level/front door on the front side that the whole yard slopes towards, basement and garage in back. Water came in the front door and also into the garage at the back. We had french drains installed in one day that totally stopped it all.
Look into it, you won't be disappointed.
French drains are the modern equivalent of moats.
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