I have the SC420, and I love it. I will never part with it, as long as I live.
The SA160 is a
Korean guitar, so be weary of the quality. Sometimes they're good, sometimes they're bad.
Plus they have non-locking trem, which always leads to tuning problems.
If you want the SC420. but can't swing the cost, check out the SCA220.
It's Korean made, but has almost the exact specs of the SC420, sans the fancy binding and also has different pickups.
My sister-in-law plays one, and it's a great guitar.
It's still 25.1 scale, which (IMHO) makes it sound pretty fat.