I´ve owned both Proson and Dynavoice, and through the years I see a great difference between the two when it comes down to quality and durability. The Proson have a pretty descent sound and could be worthwhile if you want some budget orientated satellites for you´r back/center surround, but when you compare them in the whole perspective and all the aspects that need´s satisfaction, the Dynavoice´s will be the big winner. The bass, the crunche and snappy mid-range and the crystal clear high frequencies makes it perfect for those who want to have the complete sound in two monitors.
If you want the prosons, you´ll need a pretty good subwoofer or some other complementary gear to achieve the same level of sound quality that the Dynavoices get from the beginning.
The size of the Dynavoices is why they sound so much better. Small drivers will be hard to get a descent tone from, at least when you crank the volume up to party levels.
Anyhow, it´s your decision and I hope you reconsider the Dynavoice´s. But if you don´t, the Prosons will probably satisfy and be enough.
Best reg.