to get the XBR4 if I were you. Not because I think that the W4100 will be better, but because the XBR4's price will more than likely drop. Even if the W4100 is better, my guess is that it will be only incrementally and not worth any extra cash, unless if it is a cheaper version.
As for the Samsung. I have never heard of the 69F. I wonder if it has the 120hz. Just going by the number it seems to be a step down from their 71F series so I am skeptical about it. Could be like the W3000 is to the XBR4.
Either way I would go with the XBR4 as it has been touted to have better blacks and more accurate colors than the 71F, and probably the 69F, whatever it is, also.
I plan on buying a new flat screen in the near future. I had decided on the Sony 46XBR4, but then I read CNET's coverage of the CES about Sony's new KDL-46W4100 model with the 120hz engine to be released in the spring, so I decided to wait and compare the two. I had considered Samsung's top of the line very good also, but just couldn't get past that shiney screen. I just found out something yesterday. I hadn't seen anything in here about it, so I thought some of you might find itinteresting, so here it is.
Samsung has a new model number LCD that has a non-reflective screen. Its their 69 series (ex. LN-T4069F, LN-T4669F). The funny thing is that it doesn't even show up on their web site yet. I saw it at Best Buy and, quite frankly, its very impressive. I thought it was ever bit as good as the Sony XBR.