I had my choices down to the Ventum 33, the RX5 Ultra, and the Matthews V3 31. It was a really tough choice between all three, but particularly between the Ventum 33 and the RX5 ultra. They both have the same cams so the draw cycle is almost identical. I like that the RX5 has a bit more brace height so it should be more forgiving than the Ventum but it has the same IBO spec which is cool. The RX5 also feels AMAZING in the hand...the grip is perfect for me and the carbon just feels nice.
The Ventum 33 felt deader in the hand during the shot to me. That combined with the price difference was pretty much what made my decision for me. I just didn't see enough of a difference between the two to justify the extra 500 bucks. It was tough though, that is a sweet bow, I think you are going to love it.
I talked to some Hoyt guys when the rx-4 came out and it didn't seem like enough change to justify the cost. The new cam system on the 5/ventum sounds like a great change. Can't wait to get it set up.