I'm not familiar with it... but I have used Basic Templates several times, and really like them (). They are only 5 bucks, and they have really nice website templates.
As for 'site builders', the hottest thing out right now is XSitePro. You can check it out at the link above (just below your post), or there is a video presentation that shows you a lot of the features:
http://www.xsitepro.com/cmd.php?Clk=1087981
Like I said, I havent heard of Netstudios - but I would love to hear from others that are familiar with it. Anyone here used it?