Adrian, your "high end" is only for a select few, most folks won't go that far. I'm thinking of a tool that's perhaps more expensive than the $10 version, but parts would certainly be no more than around $20. However, you make a good point, we may need to re-think the comparator speed, that will run the cost up somewhat, but not out of reason. The LM397 looks to be a reasonable choice. Obviously, as you say, it's a surface mount package, looks like that's a given.
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