That doesn't strike me as a particularly great deal on the BH6000. Certainly wouldn't risk not having a subframe mount. I'm here to tell you that the BH assembly can really get hopping once you get into a task...couldn't fathom it not being connected hard and fast to the rest of the tractor.
I paid ~$5,500 out the door...subframe, installation, delivery, etc.
I will say that the BH6000 is PERFECT for a BX, but you would find it small for any other tractor. Cut back on the smoking and drinking for a while and swing the extra dough for the bigger unit. I absolutely guarantee you won't regret it. Unless you don't use it. Then you may regret it a bit. At least until you realize how good it is at building ramps to jump your Nitro powered R/C monster truck from...I don't know anything about that...