That's a too generic question. What's best for may not be the best for rest of the world.
In terms of paid themes, templatemonster.com or themeforest.com have been there for a long time with all kind of themes. In the case of themeforest.com, they started as a WP theme site and that's their strong point.
As for free themes, wordpress.org is always the starting poit.
Before asking, do a search... if you don't find the answer, then ask The purpose of this forum is to help others in the community, that's why it's called Sitepoint and not Linkpoint. SP Guidelines - No fluff.
You can search on Google the theme named VN-News 1.1.2, then download it, you can be sure that you choose the true theme!
Thanks classifiedmotion for your help, but I didn't like the look of this theme, otherwise I like goodnews by themeforst, it's not free but clean. Anyway, I think I'm gonna to keep the theme installed, it's not not bed, but I can't modify it easily, it is called ( News Leak ), can someone help me to know how can I find the way to modify it ? it doesn't accept any front page plugin.