Agreed regarding the graphing RPL models, but the scientific RPN calculators are pretty solid. The 12C financial calculator is more like those. The scientific equivalent, the 15C, is no longer in production, but the current 35S isn't bad for cranking out calculations. The tactile feedback sure beats hitting a touch screen phone.
The 35S is buggy as hell, poorly designed, the battery lasts too little time and the keys break easily. I owned one and regretted the purchase (I went through an "own every calculator phase")
That could be an interesting HN or blog post if you wanted to do it. I'm a bit of a calculator fan myself, though I haven't used many different models. There's something about physical products, even though virtual ones are more flexible / configurable, being software.
