interesting you've heard the 453s are not as good - most reviews suggest they are even better than the 452.
price wise there is nothing near either 452/453, unless you go fod nankangs etc. but these seem to get rubbish reviews and i'm inclined to think the compound is probably not the best so they deserve to be avoided.
what are people paying for 452/453s?
the winter 439s are ok, struggled a bit last winter (i live near pyrenees) on the steep slope in our village - i had to get chains. that said i'm pretty sure no winter tyre on our rwd 330 would have coped. if you don't have chains i'd get some - mine were cheap (39eur) and are a bit tricky to fit, but i do now have full confidence i will never get stuck which is good to know.