Thanks to all of you for your advice and answering my rookie questions. My first all grain brew day went great, no real surprises (other than how much easier it was than I had anticipated). Batch sparge went well (didnt quite get the 3.5 gallons I wanted, sparged with 4, got my 7 to the kettle, preboil gravity was within 2 points of recipe) and the scottish 80/ is happily burbling away in the carboy.
My big take away from the brew was the need for a good thermometer. The floating jobs are crap for checking the mash, IMO.