For cost vs performance you can't really beat Goodyear F1's, yes there are higher rated tyres, but they tend to be more expensive.
Some would argue that you shouldn't mix run flats with ordinary tyres, but in the same way you shouldn't mix brands or types series, as long as you have the same make and series on the same axle, risk is minimal unless you're driving on the limits of adhesion. There is a place for budget tyres, it's safer to have cheap tyres than bald ones, but just look at any of the reviews on https://www.tyrereviews.com/ and see how dry/wet breaking distance changes between cost, ultimately this should be a priority, most of us only need really good tyres when you need to stop unexpectedly and suddenly. If you want a comfortable and quieter ride swap the 19's for 18", that extra wall thickness certainly helps.