I'd stick to single exclamation points and non-repetitive sales pitches.
For a professional sales presentation, I would let the testimonials, editorials, and white papers speak for themselves without slogans or catch phrases. I would simply make sure that the formatting/framing made the text attractive and easily read.
For that nuts and bolts first impression and interest builder (perhaps on the Open-emr site) I have started working on a pitch that uses active elements (video or whatever) to show features of the EMR in bubbles that pop up, fade in and out around the central logo item of OpenEMR. The central item fades in and out (leaving the logo as a watermark) with slogans like "open source works for you" and other quips like "Hospitals", "Sports Clinics", "Specialists Clinics", "Free Clinics", "Rural Practices", "Any size", "Any Language", "Any Country", "Any One", "For Free", "Forever". The satellite bubbles display mini-videos of the EMR in use interspersed with statements (Not up to that part yet actually) like "ONC Certified", "ICD-10 Ready", "5010 Ready" (currently a lie) etc...
....I actually started working on this one already

but...
Maybe no-one will like it, but I am kinda building it as an engine rather than as some impress or powerpoint document so that I can do some really cool stuff. I figured a video like that would be nice at a convention table. This let's me edit and add a wider range of elements to a final video, such as 3d stuff etc...
I wanna make a little cartoon as well. I figure it will be a line drawing or maybe a 3d video with caricature doctors walking into a room yakking to each other (Blah-Blah-Blah bubbles) as one doctor holds up his ID badge to a computer monitor in the foreground. A line laser out of the monitor scans him, then an arm reaches out of the monitor and hands the doctor a clip board. He takes it without halting his conversation or looking back as the doctors leave the room, finishing with "OpenEMR, why not make it easy on yourself?"