You have a lot of options depending on how much you want to spend.
Cheapest option is a 44 gallon Brute trashcan from one of the big name hardware stores. They are food safe and probably the most popular option. The 55 gallon isn't worth it, too large an increase in cost compared to the 44.
Next up are 55 gallon poly drums. Cheapest is to find them locally at a local farm or container store. Just make sure they are food safe. I've never had issues with used ones but some have. Rinse them well, bleach if necessary. Open top>close top. These are a good value if you have nothing locally: https://www.bayteccontainers.com/pla...nditioned.html
Finally, there are the needlessly expensive yet pleasant to the eye Norwesco and Ace Roto Mold tanks. These are extremely sturdy and can be plumbed to not be a complete eye sore like the trashcans and drums. Sizes range from 15 to xxxxx gallons, but something like the 65 gallon would be good for your application. Always nice to have the capacity to do a 90% or larger water change.
250 or 300 watt heater is fine, it won't melt the plastic as long as there is water.
Make sure the pump can handle decent head pressure and move a good bit of water. A Mag Drive 9.5 is a good place to start, but I'm sure there are better options.