“I'd spend more and get the Dewalt over the Craftsman”
Don't get me wrong, I own both a 12-1/2" Dewalt and a 12-1/2" Craftman model thickness planer - and the difference is two things:
(1) the Dewalt comes with this nifty little gauge on the front that tells you how much you are shaving off. It isn't a huge difference in operation, but it is like your care coming with a gauge that tells you which gear you are in, or not. You can drive just fine without that gauge, but it sure does make life more pleasant. Ya know?
(2) Weight - I have found that I like HEAVY tools. Light is not better when you are
p-u-s-h-i-n-g as hard as you can against a plank that weighs 30-40 lbs. The Dewalt weighs more and even though I feel like I am going to hurt myself every time I need to lift the Dewalt up onto a table, I don't feel a necessity to bolt or clamp it down before I use it.
The Craftman is fine for shaving boards thinner that are already squared up a bit, but you need to have the thing bolted down or held fast to the table and you will need to keep the tape measure in your hand or really close to measure the board every time you push it through to make sure you are shaving the right amount.
Search Sears.com
for Craftsman 12 amp 12-1/2" Bench Planer (21758) prices