Better Wiki solution than RedCloth

I am currently using RedCloth for my homebrew wiki engine. However I am
finding that I would like more sophisticated markup options … probably
to the near sophistication of wikipedia. This is probably not the
limitation of RedCloth but rather the TextTile standard.

So my question is whether there is a better Wiki solution than RedCloth?
I am looking to be able to define 1) external links, 2) internal links,
etc. Or is this something that can already be done with RedCloth through
more sophisticated customization.

The reason I am writing my own Wiki engine is that I require it to
integrate very well with the rest of my Web 2.0 engine.

Thank you,

Sharkie

You can have a look to SQLiki to see how they do it.