Help me choosing a theme

Hello,
I just registered for a membership with wpmudev. I am a world traveler by bicycle and have a blog on http://pedaltheglobe.com . Many bicycle tourists post their blogs on http://crazyguyonabike.com . The limitations to this site are users can't post links to their paypal to collect donations for their trip and also cant post their twitter and facebook feeds. I would like to turn my site into something similar so others could also post their journals on my site and have access to what crazyguyonabike is missing. I would like to have forums, classifieds, journals, and articles all visible on the main page showing maybe the 10 most recent posts in each category with an image from each. Could you help me pick the best premium theme that would allow me to do this. I have previously already installed buddypress, bbpress, and wpmu.
Best regards,
Jon