Irda Ranger said:
You're not expected to go 20 levels in any 4E class. You're expected to go 10. Then you choose a Paragon Path.
Actually, paragon path stacks on TOP of the class levels you're taking. So, for example, you take 10 levels of Ranger, then pick the Arcane Archer paragon path, and you take 10 more levels of ranger -- each of which also gives you a level of Arcane Archer benefits.
Or you could take those ten levels as a rogue, multiclassing while you're still getting Arcane Archer stuff.
Or you could have 5 Ranger levels and 5 Rogue levels going in, and continue that multiclass progression while also getting an Arcane Archer benefit every level.
I'm not sure how the prereqs for the Paragon Paths work, though, or what happens if you manage to not meet ANY of them -- or even if it's POSSIBLE to fail to meet some of them. They may have prereqs like "1 level of ranger".
Also it's not clear exactly how the Arcane Archer fits in -- for example, does it actually give you flat abilities? Does it add a list of options that you have to actively select in place of base-class options (such as adding a new list of powers you can select INSTEAD of taking a new Ranger power)? We don't really know. Probably a mix of the two, I suspect.
However, point being, R&C made it clear that paragon paths and epic destinies are stacked on top of a continuing progression of base classes, unlike PRCs.