If you have access to and can use the online Apple Store, look into the online
refurbished and clearance pages, to see if there's a fair price on refurbished.
Some are configured with enough RAM and storage drive for use as-is, and
may be a good value compared to a totally new retail model. The main online
Store inventory allows one to choose a CTO or custom order upgrade page
where items can be added or chosen to increase the usefulness in hardware.
So far, there would probably not be a listing in Refurbished page for new MacBook
12-inch model; however there are recent build year models with full complementary
warranty and these can be covered under the optional AppleCare plan, as well.
The processor and RAM values (potential, if you buy ahead of the need to expand)
are greater in the MacBook Pro, + attempt to future-proof an otherwise sealed design.
Other than the older design currently produced 13-inch MacBook Pro (non-retina,
the only one with the DVD/CD optical drive built-in) none of these allow the end
user to upgrade the RAM memory chips. You can do a few things with the recent
build model of the older design that are impossible with a fully sealed late design.
However in any event, consider the AppleCare extended optional plan coverage.
Also see if your renter or home insurance covers water/accidental damage.
Good luck & happy computing! 🙂