Santa Clarita has many nice areas to live in: Canyon Country, Castaic, Newhall, Saugus, and Valencia. There is also Stevenson Ranch which is unincorporated but near by.
The Plum Canyon area you mention is in Saugus. There is two builders out there doing new construction. You have to be careful though because KB has a CFD charge of about $5K - $7K a year on top of your regular taxes. Shappell does not have the extra tax.
There is areas in Canyon Country that are really nice and some areas that are much less desirable. I am very familiar with all of Santa Clarita and specialize in buyers.
Canyon Country is divided into tracts with some having a CFD (an extra tax) and some not. Please feel free to check my link to homes available in Canyon Country.
And my website:
Please let me know if you would like me to interview for the job as your Realtor. Thank you.