Unfortunately the downside of Behringers is their appearance. That's not surprising because they were intended for professional recording studios. To answer your question there are no grills available and they don't make a dedicated center - most people just use a one of the bookshelves for that. They just sound really good for the price and the fact that they are front ported when means you can buy frame hangers and hang them like a picture if you want to - although I recommend felt pads on the back for isolation if you do.
The challenge is your (reasonable for the room size) price point so let's look at a couple of other options.
Option 1
Boston Acoustics CS26 bookshelf speakers ($80ea). I use these as my front left and right in my master bedroom. They are rear ported which means that they do need some space behind them but they are pretty decent speakers for the price. I wall hang mine from a
PinPoint AM10 wall-mount. They make the CS225 ($180ish) dedicated center to match the CS26 and (FYI) it's critical that the 3 fronts be a timbre match. So we're up to $360ish and don't have surrounds yet. You have two decent options. 1) you could buy two more CS26s and AM10s and have surrounds perfectly matched to your fronts and would sound really great. The downside is you've spent $540 of your budget and still don't have a sub or receiver. Or, 2) you could could get by with some
Wharfefdale WH2 dedicated surrounds for $80/pr. These Wharfedales aren't as good of a speaker the the CS26 but surrounds don't do that much work. I use these as my bedroom surrounds (for now) and they work fairly well with the Bostons. Not a bad choice, especially if space is tight. You'll still need the sub.
Option 2
Five
Energy FPS wall hanging speakers. I haven't heard them but I suspect that they are roughly the same quality as the CS26. Anyway they have been discontinued and World Wide Stereo as them on clearance for $129 each. I believe that they do ship with grills but I can't swear to it. Because they are discontinued you'd have to take the plunge all at once ($650) or risk not being able to complete the set later. This is a fairly wife friendly option and I think paired with a good properly sized sub is a decent option.
Option 3
I always like to give a budget busting dream option as well. Just based on reviews I've been considering eventually upgrading my bedroom system to a pair of
Usher Audio S-520 bookshelves ($400 shipped). The matched S-525 center is $380 shipped so we're up to almost $780 and still have a $550 sub to pay for. That's your whole budget but would be a nice way to go. That's just based on reviews. You can always add surrounds later. You could also shift a couple of hundred from your receiver budget by going with a
refurbished Onkyo TX-SR707 ($480). Do read the full review and faceoff so you are aware the the limitations of these speaker but in a small room paired with a good sub and the crossover set correctly I suspect they would be sweet and very wife friendly. I'd probably try to go with something at this level and add surrounds later if it were my main listing room.
FYI:
2007 Bookshelf Speaker Faceoff
With all three of these options you'll want to set your receiver's crossover at 80hz or so and let the sub handle the deep bass. Also keep in mind that depending on the room you may eventually want to budget for some room treatments.
