I've had two 850 T5's, an S70R and two S60 T5's, the engines are just superb. Finding a good 850 these days is getting harder and harder. The saloon does definitely drive a little bit better than the estate, you can feel it's a little bit more solid, but you can't carry many bags of sand and lengths of 2x4 in it, so it's nowhere near as cool
My first 850 was running about 280bhp, Koni shocks, eibach springs, all sorts of tweaks, but when we did the front garden at the house we were at back then it happily carried all the building materials around as well as all the garbage to the tip. Fabulous things.