Yeah, I think that setup would pair well together. A few notes though:
Klipsch makes sensitive, solid, quality speakers. They are horned though so they usually sound bright. Some people like that, it just depends.
The sub seems pretty decent, but I'd like to offer an alternative in the form of the
HSU VTF3 MK4. It's a very powerful sub and is great for it's price ($800 shipped)
The receiver is very powerful and of quality build. Can I ask why you chose the 3020 over the 2020? There's a good comparison chart on Amazon
here (towards the bottom of the page). It might save you a bit of coin if you take a step down.
I know you said $5kish (with 2 subs your choices come to almost $5.5k) so I'd like to give you some alternative speaker set, but they might be at the top of your budget.
SVSound released their Ultra speaker line not too long ago. They offer a 45 day in-home trial with free shipping both ways. They also have a 1 year trade in program where you get full credit back to trade up within the first year if you want. I haven't seen any official reviews yet, but initial impressions are fantastic!
Speakers - SVS
SVS Ultra Speakers Loudspeakers Preview — Reviews and News from Audioholics
The other suggestion is the Ascend Acoustics
Sierra Towers,
Sierra Horizon Center, with
Sierra 1 bookshelves as surrounds. These will be more expensive, but they're fantastic speakers. They have an optional tweeter upgrade as well, but it would bump the budget quite a bit more.. They also offer a 30 day trial (you have to pay shipping though)
Ascend Acoustics Sierra Tower Floorstanding Loudspeakers A true music lovers' floorstanding speaker. Review By Clarke Robinson
Note: You could possibly pass on a subwoofer for now using either of these suggestions. You do have a ton of open space, so I would suggest passing on the surrounds before passing on a sub, to be added at a later date that is..