I have been a big fan of HP calculators for about 25 years now, and have  about 15 of them in my collection.  The HP-32SII is the best-designed  calculator they have yet made.  Some of the upper-end models are a bit much  and complex to use, while some of the lower-end models use algebraic logic  and are lacking in some commonly needed features.  The HP-32SII is just  right -- enough features to make it very useful, while not being  overdesigned.  It's easy to program, and its RPN continues to be one of my  favorite features.  This is the calculator I use for scientific use on a  daily basis.  You won't be disappointed with this one.