I wanted to do a quick review on EasyWorship for the forum. I didn't start with 16:9 using EasyWorship, but was happy to learn during our transition that EasyWorship supported the format. It was actually pretty easy to switch over, just a setting or two.
We started out with Powerpoint where the worship leader (and yes, during the sermon it was the pastor) manually clicked through slides. When we were ready to move to the next level, I chose EasyWorship. Its incredibly simple interface and yet perfectly suited features made it an easy choice. I've seen other programs that required an engineering major to figure out; and although I have one, most of my team members don't. The best part of EasyWorship is that I can train someone to operate the system in a week or two.
Greg Atkinson published a very thorough review of EasyWorship two years ago (it's still useful and relevant), and you can find it at Monday Morning Insight: http://mondaymorninginsight.com/index.php/site/comments/church_video_ideas_review_of_easyworship/
Regarding System Requirements, I'd recommend sticking with EasyWorship's recommendations at a minimum. Maximize your RAM, and it's a very good idea to put most of your money in the graphics card. We've had some issues with glitchy video that I think is related to the graphics card, and we've upgraded it at least once.
I've only ever once had an issue with EasyWorship lagging on transitions. Upon restarting the program, it went away. It's incredibly consistent.
Best of all, their support is top notch. They've always been very good at helping through problems, and their online forum is well trafficked by their developers. This is a big deal for me, since often I don't have time to really dig into a problem - I just want it fixed.
As Greg points out, there really isn't a perfect worship presentation software. When considering the ease of use and functionality, EasyWorship was the best bang for the buck for us. And now that we're running widescreen, it's worked great for us. Get a trial copy and test it out. You'll pick it up on your own in 15 minutes and you'll run a professional service in 30.
Questions? Comments?