To answer a couple of the questions Darren posed, I regularly perform Design for Laughter (with a bit less of a "sucker" presentation) and Cards Across in paying gigs (and also for fun).
And in casual, impromptu situations I'll sometimes do good old Obliging Aces, from Chapter 1 (overhand shuffle controls, I believe). Yes, it's a lot of shuffle, shuffle, shuffle, but it always seems to get a strong reaction.
But now that I think on it, I'd have to agree with Card Trickster and say that you should choose the tricks you like best. It may not be these. For example, there's an interesting card to pocket, and an interesting ace assembly, and much other fantastic stuff.
I'd agree with the authors in saying that you don't need to learn all the tricks cold, but maybe you'll want to just run through the steps of each one once as you come to them to decide which ones to master.
As to where to go after Royal Road, I would say if you are really interested in cards you'll need to get the Card College books, by Robert Giobbi. Work through them, volumes 1 through 4. Like Hugard and Braue, Roberto always gives the reader some great routines to motivate the learning of new sleights.