What do you need the hydraulics, 3pt and PTO for? You've got a BX, how many times would you ever put something on the JD? I assume quite a bit cheaper without those options?
Right now (and since I got it) the BX is used for digging (BH) and scooping (FEL) dirt. Has a winch on it I use to ensure trees I cut tend to sort of fall where I want them. The 3pt stuff is not on it. To put it on it, is another 30+ minutes on and 30 off.
Since the X754 is capable,(and higher Hp/Tq) I figure get it now Vs. trying to find it later. Buy once, cry once. (the pto and 3pt add about $5K to the price-can't take it with me-I'll buy the wife a new car to smooth the waters) Most tools, when I get them, I also get most functional accessories at the same time. There is the possibility I'll get a wood chipper in a year or two. I have a back blade I've used once in ten years (because install time, I just use the FEL and times the blade would be 10X easier but...
All X754 have hydraulic ports standard.