HP-40G
The HP-40G is an algebraic entry only graphing calculator from HP, based upon the HP-38G platform. However, numerous improvements in the software and the inclusion of a CAS make this a very nice math platform.
The hardware is same as HP-49/39G with a rubber keyboard. The CAS is the same as the one supplied with the HP-49G. There are no flags to set/mis-set and therefore this can be a better behaved calculator for straightforward math analysis. In essence, then: same calculator as the HP-39G, but with a CAS. Unfortunately, the limitation to 27 variables, a list-based solver, and other handicaps make this simple to use calculator less adapted to higher end use.