If you are mainly intereted in applying a consistent, repeatable, straight bevel, then the Edge Pro is without question the way to go. Even if you want to start applying convex bevels by hand, the Edge Pro is a good starting point.
Unless you want to get into power or freehand sharpening, I think the EP is the best tool. Have had mine for about 10 years, and can sharpen fine freehand, but not like with EP.
What I do with most of my knives is start them out on the EP, and then maintain them freehand with a variety of stones, strops, ceramic rods and steels. Specific tool depends on the specific blade. The exception would be a fully-convexed edge, which obviously you can't maintain with a non-resilient, flat medium.
If you are already relatively into bench tools, and tend to spend time in your shop anyway, then I could see going the grinder route. But I would get a nice grinder, not some H/F POS, lol. H/F is good for things like the $7.99 set of pry bars... things without moving parts (or fixed parts that you wish to remain fixed).
If you're more the kind of guy who wants to play with his knives in the kitchen, sip a little wine, listen to the stereo, chat with the spouse... you will dig the EP.