Yeah, I agree with Holly Jolly here... Cream paints or halloween grade makeup will always create problems for you! I have never used Mehron - but have heard good things about it - I swear by Jim Howle (but I am partial b/c he also designed my clown face for me!) and ProFace (by Leon McBryde) are all excellent grease paints...
If you are worried about ease of removal... Grease paints break-down with oil (which is why I mentioned NOT using lotion before applying your paint). So instead of spending even more money on some of the custom removal items (ProFace sells some good stuff, but Jim Howle just tells his customers to use the following

- just put some baby oil on a baby wipe and it wipes right off! Cheap and VERY quick! The baby oil on a baby wipe works on ALL grease paints - no matter the brand...
Bump a nose!