For what it's worth the version of Basic offered in the TI-89, TI-92, and Voyage 200 is probably the most interesting and powerful Basic ever released, anywhere

For what it's worth the version of Basic offered in the TI-89, TI-92, and Voyage 200 is probably the most interesting and powerful Basic ever released, anywhere; it supports symbolic math backed by a full CAS, declaration of pure functions, and a nifty feature that allows you to treat strings as variable names. Between that and the onboard C compiler I've never felt hog-tied, though I would love to see a practical Scheme system on one (there have been a few half-hearted attempts but "practical" is where it falls down).