I'm on a similar path to you right now.
Going to do a more complete survey of my yard at the cabin this weekend to figure out the best location for the BUD. Although I have read that others have used separate RG6 and landscape wire, I think I would prefer to use ribbon cable. Want to be clear on my location and length before ordering wire. In my mind, by the time I price out 2 runs of direct burial RG6, my other control/power wires, and take in to account that I can get a single continuous run of direct burial cable I don't need to splice - the price difference doesn't look too large to me.
Also planning to order some other gear and the cable from RPSSAT. If you decide to use ribbon cable, Roger says he has a dealer in Quesnel who stocks the cable. Might save you some $ on shipping.
Don't forget to order an LNBF. And, read up on movers before ordering.
The consensus based on the comments I have read from owners is that a 6 or 7 may be a better choice than an X, unless you can find a GBox.