I have a Lyman #66 on my Marlin 1895 SS that has worked well for the 10 years I've had it. I have a couple of Williams FP's on two M94's that have also performed well. On the #66 I use the larger apeture in conjunction with a gold faced flat topped blade front sight.

I use the Ashley ghost rings on my 1895 and really like them. You can find info about them here: http://www.xssights.com/