thanks for detailed comment @JBuff88 : )
Coda is the first app which I have downloaded
I tried that few hours, than downloaded textmate to compare. actually interface is important for me, thats why Coda looks cool to me for now. I dont know much about other details, maybe textmate is better for faster coding, I dont know. there must good reasons why so many people go for textmate, even more people than coda users as I found out.
I asked about notepad++ alternative because of some quick editing works. rather than opening coda or textmate.
Smultron seems good. I will give a try, thanks for link!