I have a 13" rockwell machine. I'd recommend it.

I think it's about 12-15 years older than me. I inherited it, along with 80% of my tools from my grandfather.
I do think that the heavier the machine, the better

Keep in mind, if you plan on using roughsawn lumber, you should be using a tablesaw, jointer, and then a planer to get your boards square. If you're just taking dressed lumber down in thickness, a planer will work out fine for you.
I see a lot of good reviews on the dewalt planer on amazon. It looks like a decent machine, but i don't think you'd be able to throw a 12' board through it without it tipping over. Yet again, it depends on what you're doing.