Recommend me a vacuum cleaner

I am in a vacuum cleaner market again. Would appreciate your honest suggestions. This is what I am looking for:

• Easy to use
• Must work on carpets, hardwood, vinyl and stone floorings
• After vacuuming I should feel 100% safer for my infant to crawl on
• Easier to maintain and long lasting

I have had varying experience with different cleaners I have owned so far.

1. Hoover canister - The plastic broke and lost suction otherwise loved it. Was too loud.
2. Brissell Upright with bag - Use to lose suction and frequent bag replacements.
3. Shark bag less - Absolutely loved it. But the one I had was relatively small.
4. iRobot Discovery - Loved it at first but then started giving problems till it almost broke.
5. Dirt Devil - Was tired of expensive vacuums so bought this one. It was okay at first but now loses suction and does not pick up hair or even small crumbs.

So? I am looking for one again and this time am more resilient and looking for one that I could own for the next 15 years without having to replace one. Suggest!

BTW: I bought a Shark Navigator from BBB (A real great store) and it just blew my expectations. Carpet feels like I just had it installed.