A little more than 1750 will likely be good enough for many of the UCs... Irvine, Santa Barbara, and Davis even-- assuming your HS grades are very good, and your classes are challenging. CSUs are easily within your reach with that score. Still, it all depends on the rest of your application.
That being said, you should aim higher than 1750. Its not a horrendously terrible score, but you would have to score higher for more reassurance/leverage when applying to colleges, which are becoming far more competitive.
EDIT: For Reference, I scored pretty low my first time on the SATI. After a bit of preparation, i scored 2200 on SATI. And for SATII (which I didnt prepare for), 780 Physics, 740 Math, 710 US History. Those scores got me into UCLA and UC Berkeley, UC Irvine (with merit-based full tuition paid). I currently go to UC Berkeley. The range of scores that people have here is huge. Some scored significantly higher than I did-- and some lower. Most, if not all, had near perfect grades with the most rigorous courses offered in their High Schools, however.