Andre:
For what it is worth, I'd skip the Atlas track and go with the Peco code 83. Bought all my Peco track thru Tony's Train Exchange about a year ago, when there was no Atlas to be had. Looks better than Atlas, is just as easy to work with. Price was about the same.
Peco makes a darn good switch too. I didn't buy any of those though, I'm sticking with the Walthers / Shinohara. I've had very good luck with them over the years.
Regards,
Jerry