I spent about two hours with the bijou -> km105 -> ECR-500 rig yesterday, and i have to say it was very nice. I really must add a muting/delay circuit and pre-out jacks to the Bijou to make that rig easier/safer to start up. Currently i wait for the bijou to warm up, then plug the kenwood into the headphone jack, then turn on the kenwood.
Your Dared MP-5 will probably do a good job of driving the ECR transformer box.
I can loan you my ECR-500, you know. It's not as though i don't have other cans to keep me distracted.
[Random rant on]
I spend a lot of time yesterday listening to my speaker rig and sadly I have to say I prefer it to most of my headphone gear. It's the smaller SAP Trios with wooden horn powered by my hybrid tube/MOSFET DIY amp that I was listening to.
However the detail and intimacy seems greater with headphone, so I am not now where I stared when I fist was forced to listen to headphones due to kid/wife/family disturbance issues. Now I really appreciate headphones for a different experience they give you. I now sometimes reach for headphones as a choice, not as a last resort.
[Random rant over]