My own personal suggestion would be either of these:

TITLE Boxing Headhunter Reflex Freestanding Bag | Freestanding Punching Bags | Boxing Heavy Bags & Heavy Bag Stands | Punching Bags & Punching Bag Stands from Title Boxing

TITLE Boxing Power Reflex Freestanding Heavy Bag | TITLE MMA Heavy Bags | TITLE MMA | Shop by Brand from Title Boxing

The second one being most likely the better of the two. Adjusts to well over 6' offers spring recoil so you are not just hitting something that is stationary.

I myself have a wavemaster. Bought it at Big 5 on sale. I filled the base with water and it tends to wobble a lot, the foam wears out rather quickly, and I'm 6'3" so even at it's hightest adjustment it is still kind of short.

If the bag from the 1st link was available when I bought my wavemaster, I definitely would have gone with the Title bag. Seems like a good value for the money.