Thanks for all the feedback!
I am going to have the chance to listen to both this weekend, but I have to say I am still leaning toward the 4400. I have a non-working 4400 that is really beat up and missing some of the slides on the front (too ugly to fix), but I just like the look. I prefer the look of the BM6000 quad, and hope to have one someday, as my 4002 has the CD4 circuit, but I like it only for the look. As for the 6000, if it is anywhere near as monstrous as the 8000, I don't think I have room! I did purchase an 8000 on eBay ("just serviced at the local B&O dealer" - yeah, right....) and the right channel was out. But that thing was HUGE! I did return it and was refunded. He resold it for $9.99. Should have bought it back and fixed it, but.....
My favorite I have right now is my 80's BM5000 with the MCP and hand-held remote. It's playing through RL140's, which I have wall-mounted and they really sound amazing that way. It's a medium sized room, so the power from the 5000 seems to be adequate for them. Wall mounting really brings out the sound, better than the floor stands - in my opinion.
I'll have to report back after the weekend on the details!
Thanks the input!