It depends, if you are a novice/intermediate CSS designer or
advanced. The great thing about being abel to turn off their CSS is
YES, you do have to replace or override their CSS. If you mess up
and delete a property you'll be scratching your head when things
look like crap. It's just more work. And you will almost always
find something in their CSS over-ruling you.. and have to throw
some !important's in their cause your tired.
If novice/intermediate , why not use Socialgo's structure.. it's
pretty clean and stable. Download their main CSS with
web-developer FFplugin or another CSS nabber. Work on your own
server space or hard disk when your designing, delete and add CSS
rules at will. Get it just how you like...
What I do is grab the source for the HOME, MAGAZINE, FORUM, VIDEO
and PROFILE pages, link my CSS, and work off my hard drive with
them. this will cover you on most of the layout you will need to
address.
If your more advanced, how great is it to just grab the XHTML and
build the site like their structure and borders/buttons never
existed? You'll most certainly come up with something that looks
nothing like SG... but, you'll also have to work out the bugs and
browser compatibility they have already done.
ez