I second keeping sarge for a bit to learn your way around. Most dependency problems should be fixed once package move in etch though.
But if you used slack you'll learn it pretty fast. Especially if you read the manual
If you're just prepared for it and you know the tools you could also just try sid. Maybe start with sarge install, use apt to upgrade it to etch so you know the procedure. Play around with etch till you get the hang of the tools or know where to look the easy things up and then upgrade to sid.
Sid isn't that scary though. I started using it a few weeks after I installed linux for the first time. Though I must say it sometimes would have helped if I knew the tools