First of all, don't rule out the Sharpmaster. That might just be all you really need. What are you sharpening, and how often? It's a very good, easy to use sharpening system that won't bust your wallet. For someone only doing Kitchen knives I'd recommend this to them over buying an EdgePro.
As for EdgePro, the real difference between the Pro and the Apex is the base. I've used the Apex for years and have never regretted the choice. I haven't looked at the EdgePro site for quite some time, so I don't know what sort of bundles Ben is putting together these days but I can tell you what I use, and what I would buy if I were getting a new setup.
EdgePro Apex, 120, 220, 340, 600, 1000 grit stones, an assortment of polishing tapes. That would be basic. To that I'd add one extra 120 grit stone, 3-4 stone blanks (or more) and 'perhaps' some extra polishing tapes. With this rig you will be able to re-profile and sharpen to a perfect mirror finish any length blade using either single or double bevels. You will have the best possible beveled edges.
{Whoa!! I just went to the site! Lots of new toys! Maybe you'll want to add a tape blank too! Forget buying the extra tapes. When I bought mine we only got a few of each grit. Now I see he is shipping 15 of each. By then you'll be more comfortable with using them and can make your own from the DIY shop... On the other hand, at only $7 for a set, you might be lazy and buy them instead.

}
These days I usually buy my polishing films at a local DIY shop but they aren't adhesive backed. Not a problem for me. I've mounted a course diamond stone on one of the blanks, put some broken Sharpmaker stones on blanks, as well as made up some leather strops on other blanks.
Have fun!
Stitchawl