TinyMCE vs. FCK Editor

I have two websites I recently installed Drupal 6.3 on, and so far I havent had but small little issues. I know one major downfall to the Drupal core is the lack of a built in WYSIWYG text editor, and that hopefully will be addressed in 7.x.

My problem is that I am using TinyMCE on one site, and overall I feel like it is the better text editor when it comes to clean html, but I really like the feature in FCK to add the break for the teaser.

I would like to hear what other people's thought are about this, since I have not found a quick way to insert the break with TinyMCE other than entering it in the html manually, which will not work if I have a more novice person creating content.

I also seem to have no choice but to use the editor's default css, because everytime I try and use the default css the color's are terrible. Does anybody know if this is related to the theme, becasue I have tried multiple different themes, all with the same effect.

Thanks