Gentoo is great if you have the following:
A) A fast CPU for compilation
B) Time to spend to get the base system built
C) Have a nice broadband conection
I ditched it due to A and B, and the dwindling amount of free time to spend doing emerges. IT is stable, and great (well, since it is about as close to LFS as you can get), and definitely customizeabe to anyones' needs.
If you got the time, go for it. IIRC you have done alot of LFS, so it should be similar in respects to that.
[edit -- typo]