I have a z5 5-25 and it is a great scope. I had a hd5 and it is very comparable. The major difference is the z5 is sharper and a little better clarity on the top end. The reticle is a lot heavier on the hd5 which works great in low light.
I think you would be happy with either

"If you got it, you got it!" In memory of Pops, gone but never forgotten