Have you checked these out?:

http://www.barebones.com/products/TextWrangler/features.html 

http://macrabbit.com/espresso/ 

http://www.panic.com/coda/ 

and of course; Panic's awesome FTP client:

http://www.panic.com/transmit/ 

I think panic.com is your best bet... they make awesome software.

Hassan's Suggestion / Request:

My suggestion may help solve yours... One step closer anyway; then they would have to add a sync button.

http://feedback.textasticapp.com/topic/112995-add-a-server-time-offset-field-to-match-local-time-so-local-files-have-same-time-stamp/