Matching is less important for the rears. I would just worry about your front sound stage for the time being. The phantom center is a good plan, and this lets you focus on a good pair of towers.
Some options include:
PSB Image T5
Klipsch RF-62 II
I have never heard your speakers and don't see a lot of information on them, so it's hard to say what kind of sound you are accustomed to. My best advice is to go out and try to listen to a lot of different speakers so you can at least narrow down the kind of sound you are looking for. You have a lot of options at the $1000 price point so take advantage and do some auditioning.
Denon AVR-1713 | EMP E55Ti | EMP E56Ci | EMP E5Bi | BIC F-12