I'm very new as a blogger but the hubs and I have maintained other websites in the past.
I know it's a jump but I would seriously consider self hosted with Wordpress.org.
By submitting Content to Automattic for inclusion on your website, you grant Automattic a world-wide, royalty-free, and non-exclusive license to reproduce, modify, adapt and publish the Content solely for the purpose of displaying, distributing, and promoting your blog. This license allows Automattic to make publicly-posted content available to third parties selected by Automattic (through the Automattic Firehose, for example) so that these third parties can analyze and distribute (but not publicly display) your content through their services. You also give other WordPress.com users permission to share your Content on other WordPress.com websites and add their own Content to it (aka to reblog your Content), so long as they use only a portion of your post and they give you credit as the original author by linking back to your website (the reblogging function on WordPress.com does this automatically!).
None of this is inherently BAD really. But if for some reason you don't really want it, you have no choice in the matter.
Also there are things like variety of themes and custom plugins to consider. There is more to choose from with a self hosted Wordpress site. Depending on the host, it may be cheaper in the long run than upgrading on Wordpress.com.