If you think you won't have a termination, then avoid the amnio - ok it may give you peace of mind but there's a mc risk.
If you're pretty sure you'd terminate, then it's a matter of deciding at what risk you decide to gamble vs. amnio.
Bear in mind there are loads of other problems that babies can have that aren't detected by amnio - you'd only be eliminating one of many different things that cause the (1-4%? can't remember exactly) fraction of babies who do have congenital problems to have those problems. So bear in mind even if you do find out and have a termination this time you won't be guaranteeing your next child has no problems, just that this particular problem won't happen this time. Someone can be the 1 even if you have 'good' results of 1 in 5000 or whatever.
I'm not trying to persuade you either way, but those are the sorts of things that became relevant to my own decisions when pg at different times (Downs odds 1 in 17000 first time, 1 in 500 second time, nuchal+bloods each time, both babies fine). I agree that 1 in 200+ is not that high at all - personally it was 1 in less than 50 that would have counted as a relatively 'scary' result for me, and even that's 98% certainly fine. At 38, I would have been very happy with 1 in 200. But then I wasn't aiming to rule out Downs at all costs (or I'd have gone straight for amnio), just to start with a blood test, possibly just to get me prepared if odds looked relatively risky for Downs in advance of the birth, and cross later bridges when I came to them.
Not sure if any of that helps - it may help you to sit down and write it all out, too.
Bear in mind 16 week tests for Downs are much less accurate than those carried out earlier - nuchal + two sets of blood tests looking for several different markers can change the odds a lot (either way) - so if you're not sure you'd terminate maybe think twice before having amnio+mc risk based on possibly not that good data.