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If you already have a domain name - then you can use Blogger ( Blogspot ) and transfer your domain name to that. ( which is certainly CHEAP-er since the cost to run a site on Blogger is " 0 " ) ; and there are many Wordpress Themes which have been converted for Bloggers platform which you can find , customize and use in order to make your blog more " professional " looking.
Secondly - There is always Tumblr's micro-blogging platform which works just as well as any other platform ( depending on HOW you utilise it ) ; and there are also a great deal of Free & Premium beautiful themes to skin your site with.
Lastly - in order to make your Blog appear more like a Website as you say - you can do this by creating a " HOME PAGE " ( you can create "PAGES" on both Wordpress and Blogger ) ; your HOME PAGE must represent your ' work ' or portfolio etc, and anything else which your " niche " is all about basically.
If you are skilled in Wordpress or Blogger Theme Customization - you can basically create your HOME PAGE to anything you desire.