The Wood Whisperer did a good review of several miter gauges a couple of years ago including the 1000 SE and HD that is worth watching.   Maybe I am missing something but I don't really see much use of the vernier gauge with 1/2° (+/-) adjustability on the 1000SE being that useful with 5° detents.  It seems like you would need 1° detents for that be useful?  

Between the 1000 SE and HD, I think that for only $10 difference ($155 vs $165 on Amazon), I would go with the HD.  While I do not need 1° granularity (finer with the vernier) often, I have actually used it once or twice.    If you need an exact angle like that, having the ability to lock it in without guesswork is nice.  

Note that  I have the discontinued Incra 3000 (replaced with the 3000SE) which I think has the same protractor with 5° detents as the 1000SE but also has a micro adjustment detents that gives 1/2° increments between the built in 5 ° detentes which gives me 1/2 ° settings.  

--Nathan, TX. Hire the lazy man. He may not do as much work but that's because he will find a better way.