Thanks Chip, the S&H looks pretty good - I'd used the one listed on Yves Usson's website, older fet based design that worked out for my CSY-2AE retrofit... The one from Old Crow uses the integrated S&H which definitely would be easier in some respects - I'll have to see what else he might have posted.
I came across your own Blog and enjoyed the projects you've got listed - thanks for posting!