Hi there, just join this forum, hope this topic is still alive!
I own some MiniDisc Players, among those an EH 70 as well as RH1 and RH10;
while the RH1 is a must have, I sometimes enjoy the nicer display on the RH10 but for sound quality I always turn to the EH 70 ... so, first-off, yes it is worth investing in it!
There are multiple ways to power it, pls. let me know if you are still 'in the market' for a solution, I found quite a few ways to go that are quite easy and mostly unexpensive ... just let me know if you are still looking. I assume that product for sale in Europe are even more easy to find in the US (living in the EU and assuming you live in the US).
Friendly