A good set of well matched speakers (that you like/love) will serve you well. The other stuff like your ht receiver, dvd/Blu Ray player and tv will come and go as technology evolves.
Around 25 years ago I bought my first home theater system. I blame my neighbor Richard for my audiophile addiction. He had a pair of Klipsch La Scala’s. When he wanted to sell them and "downgrade" to a pair of Heresy speakers, I wanted to buy them. I was 15. I had the money. Parents said no. Sorry about the trip down memory lane. Back to the ht system. I got a Sony 5.2 Prologic receiver, a Klipsch 8" sub, a pair of KG 1.5 speakers and a matching center for under $1000. Would have been around $1300 if I got matching rear speakers.
My wife was getting "concerned" about the cost. The salesman asked if I had a pair of speakers at home that I could use for rear speakers. He literally said anything that could make noise would work. Low pressure salesmen and a family friendly environment. We did our shopping with a 4 year old in tow. This place had the lion king playing on their av displays.
So 25 years later, one receiver upgrade, at least 5 dvd players, two Blu Ray players, three TVs and two VCRs I kept the original speakers. After the second move I did replace the rears with ceiling speakers.
The trick to matching LCR speakers is having the same or very similar drivers. I was going to suggest the Zu Audio Souls for $2600. I now know they are out of your buget. I am putting this out there for other people following this. The matching speaker is their Cube for $500 each. The Cube would make a nice surround speaker, but you would need a subwoofer or two.
To sum it up: You could buy 5 Cubes for around $2500 and use the subs you have. You could go with the Soul/Cube for around $3100 and use what you have subs and rears. A pair of Souls and three Cubes would run around $4100. Zu Audio does offer a 60 day in home trial.
Why the Souls and not the Omens? Simple math. A pair of Omens is $2200, a pair of Omens bookshelves is $1800 and an Omen center channel is $1200. $5200 total. Although you don’t have to buy them all at once.