It's funny... I was watching that one too. I liked the fact it seemed complete, but without knowing if it had the memory board in it I didn't want to risk it. I actually sent the seller a note asking if there were any cards installed that he should mention it in the listing cuz that could bring the price up.
Alas, he didn't... and I ended up snagging a rather dirty, beat up looking HX for a heck of a lot less. Took 3hrs over the weekend scrubbing each key and the case, but now it looks nice and nearly new! (and this one had the RAM board fully populated).
I think one of the main reasons this one is going so high is because it's effectively complete. Especially from a 'collectors' point of view. It has the original box, manuals and disks. Kindof like how star wars figures from the 70's tend to sell massively higher if you have the box or still in the box.
In any case, now I finally have my 'first' PC again to play with... (got my first computer 'back' again a few weeks ago via eBay which was a CoCo2). Just gotta find a way to get a serial port in it. Ordered the parts to convert the plus header into a regular ISA header and i'll jam in an old RS232 card.... with any luck maybe I can rig up a VGA board as well. Since TV out really stinks.
--Chris