I do have a BK9 here at home, but I want something more portable to use on vacation. I actually tried, and the BK9 is too wide to fit in the rear hatch of my car (it barely fits across the backseat!) I also think that it's too nice/valuable to risk the abuse it may encounter.

The BK7m doesn't have style editing capability, so that's out.

The E-A7 is also expensive. Although it has much advanced functionality, MIDI selection of User Programs is not expressly documented in the manuals. The E-A7 uses ten banks of ten UPGs instead of sixteen banks of eight. So even if MIDI selection of user programs is possible, the starting memory address may be different. Maybe it's worth bugging Roland Support about the E-A7 so that others will know whether it's possible to select UPGs via midi on THAT board, and how!

In the past, I've seen BK5s sell in the $3xx - $4xx range. For that price it would be a worthwhile acquisition. But I still have to sell the Prelude and some other boards that I've acquired through the years and don't play anymore.