I presume from looking at your Avatar and your wheel description that you have the 16" 7j TT wheels which are the same wheels that i currently have on my TDI Sport too.
Your 185 tyres must be really stretched on the 7j rims as they are really for the 6j rim and i would presume that the previous owner probably swapped the tyres over off his 6j rims when he purchased them.
My wheels are currently wearing the 205/55 16 tyres that were standard fit on the wheels when they were on the TT that they came off and with my car being a sport and having the 10mm lower suspension when i have the car loaded up and go over a speed bump they can touch the rear wheel arches, not enough to do damage but enough to make a rather unpleasant noise and also on full lock they can just touch the inner wheel arch linings at the front but this isn't really an issue.
They also really fill the arches and whilst they give a lot of extra comfort, aesthetically look wrong to me, a bit like 4x4 tyres but i don't think i would be going less than 205 on this width of rim though, as this is pretty much the least tyre width that would give you any kind of rim protection at all.
Therefore in my opinion and with your car being a sport i would agree with the previous advise and go with 205/45 16.
If it was an SE with the slighly higher suspension 205/50 16 would probably be the choice as many others have used to gain a bit more side wall comfort and this size may still be an option to you.
Remember all different makes and models of tyres have different characteristics and even dimensions, meaning although it may be an identical size one tyre may offer considerably more rim protection than another identically sized tyre and look very different on the rim too, so do your homework before buying.
Hope this helps.
