Lisp

So I was making a kind-of-real-time 4chan interface in C# and then I though "holy fuck, why am I not using Lisp?"

I'm hoping that Lisp has thread and regexii support and good HTML parsing/XPath libraries, and I'd be grateful if you guys could describe the various ways in which I could enhance the syntax or use an embedded DSL or whatever in Lisp (macros, I suppose? There are different types of them, aren't there?).
And also, what are the differences between various Lisps?

>>8
Oh gosh, I haven't expected to get such a in-depth reply! Thanks!!