If money was no object, we'd all be putting the most expensive tyres on our cars and replacing them at 5mm tread depth. The reality is that unless you own an oil well, money is limited and people have varying levels of "value" that they are willing to tolerate.
I had no problem at all with 19" Acceleras in summer, wet or dry. As temperatures fell, they became a distinct problem in the wet. So I got a set of Falken winter tyres in 19" (and a spare set of alloys, ouch), and put those on.
I don't think Acceleras are any better or worse than Pirelli in warm conditions, dry or wet. I know that the Falkens are a shed load better than standard Pirellis in winter conditions.
My advice would be to buy a set of Acceleras for summer use, drive it like you stole it, and put the saving towards a set of winter tyres. Over 2 years, the cost will be the same, and IMO, you'll be better off from a safety perspective.