Image Verification options

For those of you using Image Verification to block spambots, what options do you have set? I have them all ticked except Random Shapes, which I feel makes it too hard to decipher. Which would provide the best balance between readability and blocking bots? Also, for those of you who use a custom font, how do you deal with it if the font is too wide?

 

I'll have to find it on vB.org, but I found a great mod that gives an all-new type of image verification...it shows several pictures to the registrant, and they're asked to pick which one is a...

Like: a bird, a flower, a building, etc, and you can add your own photos (and name them appropriately.).

Seems to work for me!

 

That is a good mod, this is it here if I am correct:

Enhanced Image Captcha - Stop bots from signing up! - vBulletin.org Forum

 

That's the one!

Thanks!