I second this. I swear if I see "buy a new computer" one more time

. I think they should've separated the forums "MacBook 12in" and then this. They shouldn't even have the MacBook title. These new "MacBooks" are awful, a single port for everything? Really? And too thin. I don't want a laptop that's thinner than a pencil. I want a functional one, that doesn't have one port for everything.
As for the topic at hand, definitely stick an SSD in it. Literally booted up in like 10 seconds. I threw in a 50$ Intel 520 SSD. It really makes a difference. Feels like the latest and greatest MacBooks. OS is very responsive.
And I recommend you do go to Mountain Lion, even though it requires a work around(which is pretty easy!). Lion is even losing software support now. In my opinion, lion was the "Vista" of OS X. I owned a mid-2007 with the GMA 950(sold it now though).