It depends what you want ~ if you use a layout you'll get a more polished site, but as you say it will be another polished clone.
Alternately you can put together a site entirely yourself and it could turn out to be a buggy mess, but you at least have the chance for it to be totally
your buggy mess
I personally don't find template based sites interesting and I don't tend to spend much time on them. I'd much sooner see someone's buggy first attempt than a clean layout someone else made thats been skinned. However, it's your site and you should not be making it based on anyone else's preferences.
You might just be interested in sharing art or text, and in that case the layout may not be important to you so using a template is a good idea. You might also find that studying a layout is a good way to learn, and in some way's it is, and in other ways it is not.
Regrading layoutit - I think grid based sites (the kind it's making for you) are the most confusing kind of site and you wont learn a huge amount from them. You'd be better off looking at some of the layouts linked here like these ones:
https://forum.melonland.net/index.php?topic=3574.0 and here
https://wiki.melonland.net/free_code_templates
The best way to start is to have no layout at all and just add bits based on what you learn

You dont need to use an entire layout, you can just steal bits of it ~ try and copy them out and figure out how they work if you can.
That's not how most people like to work, but it does give the most interesting results!