IWB - Decisions Decisions

It seems now it's not a case of should we get an IWB, but which sort of IWB (Interwrite, SmartBoard, Promeathean). Do you go the whole hog and get a board or start with a tablet or both? Where should we put them in the school? Lighthouse teachers throughout the school or a syndicate (faculty) focus?
I was impressed at this Demo (Sitech Interwrite) at SPS today. Mainly because teachers were tuned into it - its was great to see them with their tongues hanging out rather than with their eyes glazing over and rolling back in their heads :-) So what better place to start - teachers with a positive mindset - you won't get anywhere without that, whatever technology you put in their classrooms.
Another great thing about this Demo was the whole pedagogical approach - every opportunity was used to involve teachers in real learning examples across the curricula & at various year levels. Sitech offer free on going PD support after the installation of their IWBs with a focus on learning & teaching not just technical. Tools & features are very similar to any other IWB though i was impressed also with what i thought was a superior capability of converting anyones chicken scrawl writing to text. It will be interesting to follow the progress of our teachers with IWB & see if they can really make a difference or will this be another expensive weapon in a 'chalk & talk' arsenal.