Can someone please recommend warmest comforter to use in cold winters. Thank You

I’m sick of fighting with layers of blankets, I want ONE comforter to rule them all. I’m a cold sleeper in a cold bedroom that regularly drop below 55F in the winter. I added a wool Pendleton blanket to my cheap comforter last year and I still had to add an additional throw blanket to keep warm enough.

I’m looking for an extra extra warm comforter, one that’s so warm that I have to change it out for summer. Not remotely all season. I’m open to down or down alternative. I don’t care if it’s heavy or lightweight, or how fluffy it looks. Corner ties are an imperative, I will be using a duvet cover.

I’m willing to spend for quality that will last, up to the $750 ish range that a feathered friends duvet costs (Queen sized). But I was questioning if I need to pay that much if I don’t care about it being lightweight, I’d be happy with a heavy down alternative option if it’s just as warm.

Thanks for reading my rant/request!