Tank thickness

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I'm thinking of getting back into the hobby after a 20 year absence
Last tank I had was a store bought 55g size, rectangular, with bowed
corners. It developed, after 2-3 years, about a 1" bow across the
front. Scared the heck out of me. It was a fish only tank.



This time I want a 90-110g tank, rectangular, acrylic with the bowed
corners. How thick should the tank be so that it stays flat after
years of use?



I would like to buy it used. What's the going price/gal for a used
tank? And the stand? and the hood?



Can anyone recommend a web site so I can get a look at it?



Want Don't want



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(Art Challenged :)



Thanks everyone.