I was gonna get a eclipse 3100 and was really looking into it but i heard from supa c and some other member's that they lack many things and are not as good as the rest of the eclipse line.
never used a 3100, but had a 8445 and loved it, heard good things about the 5100 however, ill be picking up a 7100 or maybe the new 7200 whenver it comes out
I have a CD5000 that I have been considering selling. If I do, I will also have the Sirius tuner and the Ipod "box" with cable. LMK if you are interested.