I'm not too far out of high school (graduated in 2011) and I used an HP-50g. Most people when I was there used a TI-83/84 derivative and occasionally the TI Ins

I'm not too far out of high school (graduated in 2011) and I used an HP-50g. Most people when I was there used a TI-83/84 derivative and occasionally the TI Inspire. The hardcore used a Ti-89 or an HP-48/49/50 series.