I just bought the s230u for $507 + tax. Great deal and no brainer as long as the fan stays quiet. I even get usb 3.0 and an i5 instead of the i3. Only downside in my opinion is the 4GB memory.
Install TPFancontrol and your fan will stay quite, the computer comes with a single RAM slot so you can replace the 4GB module with a 8GB one.
What mSATA drive were you looking at for $120. Any suggestions on a brand? Amazon has an "offbrand" for around $99 + shipping.