OK, my trusty 25 year old 32S II is finally showing its age - a row of buttons on the right side of the keyboard seem to have some intermittent connectivity problem. So, I figure it is time to upgrade. I want RPN - algebraic entry is irrelevant to me. The choices seem to be either the 35S or the 50g. I like the 35S as the layout seems to be very similar my 32SII. The 50g is enticing as it has graphing capability, although I have lived without it for all these years and I'm not sure I really need it. Moreover, the keyboard layout of the 50g seems to be a compromise to accommodate algebraic notation - I like the large enter button on the left side on the 32SII and the 35S whereas the 50g has it tucked away in the bottom right hand corner. From a capability standpoint, I know that the 50g has RPL, external SD card, etc. etc. Not sure I need all that stuff. Basically, I am looking for inputs from anyone who has used either or both of these models and and comment on them. I am an electrical engineer, working in semiconductor R&D, if that matters. Thanks!