If you don't care for any of the Buddypress-comptible themes that you've found, it's possible for you to use a standard WordPress theme on your site. For this to be possible, you will need to add BuddyPress support to your chosen theme. Doing this isn't as difficult as it sounds because you can use the BuddyPress Template Pack plugin, which is available at http://wordpress.org/extend/plugins/bp-template-pack/, to guide you through the process step by step.
Before you begin working with this plugin, however, you must first activate the WordPress theme that you're planning to use on your site. To do this, visit Appearance | Themes and then click the activation link for your theme.
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It is fine to get started on a hosted solution like Blogger.comor WordPress.com. They will allow you to learn the basics of blogging and web publishing without spending money. As soon as you nail down these basics, however, it is vital to buy your own domain name and to purchase a web hosting package with some company.