Cool. That RTD converter should be fine. Another great place for sensors and stuff is Omega.com They'll send you ton's of huge catalogs for nothing
If you need any help programming the logo's, let me know. We have a few here that I have installed lately (read:6) and im gettin pretty good at it LOL
As far as wireless communication, on a budget, I dunno
would like to get one of their communication modules to see what can be done there...