Which HP for my "twenty buck shootout"?

[Guy Macon]

I am in the process of comparing the top of the line non-graphing non-programmable scientific calculators from all of the major manufacturers. I hope to put together a comparison and publish it online. So far I have sitting on my desk:

Hewlett Packard HP 35 (EDIT: Stupid typo, HP-35S)

Casio fx-991EX

Texas Instruments TI-36X Pro

Sharp EL-W516T

Canon F-792SGA

My question is whether the HP-35S is the best choice for such a comparison, or whether I should pick another HP model like the SmartCalc 300s. All of the others are less than $20 and so is the 300s.

The HP-35S is over twice as expensive as the rest (and in my opinion has over twice the quality) and doesn't have Textbook Format Display (similar to Casio's Natural Textbook display and TIs MultiView display) so is it really the best choice for such a comparison?

BTW, my personal daily use calc is a SwissMicros DM42, so I may have a prejudice in favor of HP.