Don't completely put a bungalow out of the question, it all depends where you want to live, there are still some out there that are not too badly priced, keep an eye for them.
I sympathise with your problem of not wanting to make noise, I have a very similar situation and the thought of inflicting that type of noise on close neighbours is hard. We ended up in a semiD with a little garden, fortunately with a family of 4 next door, also with similar situation, so they understand. You won't find any that are only one level though.
We tried looking at condos
, as facilities etc make life so much easier, but you have to look hard to find well sound proofed ones, they are around, we only found one, the others weren't in any way noise proof, in fact whilst looking we could hear the neighbours so it wasn't a good move.
If you need one level only then a bungalow or condo
are the only way to go. Your budget should get you something pretty good in the way of a condo, depends again on where you want to live.