Too bad you already got he stand them VTI's are amazing, I would compare them to stands i have seen at musicdirect for $3000 lol...
OK, So, I personally am not a fan of ARX, just don't do much for me for the price, I also looked into them... Since you are set on towers, (I did the same thing, I have towers in my 2.2 and the bookshelfs of the same speaker actually sounded better, but I owned them both and used the towers...) Anyway, check out the sierra towers, since they are in your budget, the center is expensive but you are going to find that with an expensive set of towers, call dina and Dave over at ascend and they will answer any questions you have. I like the towers with the std tweeters...
Sierra Tower Bamboo Loudspeaker Very high quality speaker...
I would move your surround budget to the fronts and sub, go for dual subs maybe dual vtf3's and you won't regret it at all...
Next is your avr, your budget permits a decent denon, yamaha, or marantz unit, just get the most you can from one of them companies...
MARANTZ SR7005 3D Ready 7.2 Home Theater Networking Receiver | Accessories4less
DENON AVR-4310CI 7.1-Channel Home Theater Receiver w/ Networking | Accessories4less
you can get a lot of avr for that budget...
PS IMO the dual surround BS is just that, I have heard systems setup properly that I don't like the effect of 7 channels, there aren't even that many movies recorded in 7.1, and it pulls you out of the material, with the couch on the back wall don't bother, its going to be a waste. 5.2 will sound better, my brother went crazy with 11.2 its a 7 ch with front highs and rear highs, its non sense he admits it, and said when he remodels or paints he is burying the cables and going to 5 channels and 4 subs, smooth strong bass adds to the feeling and experience of a movie more than 100 effect speakers ever could... I watched 2 guns {again, I like this movie} today and the house rumbling away makes you feel like you are on the scene, and you forget you are in your living room, effect speakers {especially when done wrong} tend to pull you out of the material and throw your attention to where the sound is coming from... Its fun to think someone just slammed a door in your driveway or see the dogs go crazy when someone in a movie knocks or rings a doorbell, but 5.2 does that just as good as 7, 9, or 11....