Last winter it hit -17 in Edinburgh, and I cycled into work every day. I wore just a Buffalo Special Six on top, shorts down below and I was toasty warm.
However, given that the Buffalo is a bit minging to look at, I'd suggest either a down jacket or a synthetic equivalent. Is Sweden likely to remain below zero? If so, get a down jacket as it suffers badly if it gets wet but is fine in 'dry' cold. Something like an Alpkit Filo, with a wool base layer and perhaps a fleece as well. Alternatively, a Montane Extreme might be an idea as it's like Buffalo but slightly better cut.
For your legs, wear long johns, then a pair of trousers over them. Trespass do a cheap pair of softshell ones (around £25-£30 I think) which I've worn for winter mountaineering in Scotland with no problems whatsoever.
For your feet - I have no knowledge of snow boots, I just own winter walking and climbing boots. My plastics are far too heavy for your use, but are good to 8000m so are fantastic in the extreme cold. If you're not averse to wearing a set, you can pick up a pair of used Scarpa Vegas on eBay very cheaply. If at all possible, get the High Altitude version as they're warmer. They're ugly and heavy, but they do the job.
Buy your boots slightly big so you can fit your socks in, you really need wiggle room for your toes otherwise they'll get cold.
Gloves - I personally wear liners then a pair of Black Diamond ladies ski gloves - I've got thin fingers. This combo was almost too warm for -10 this summer in the Alps, so I reckon they'll be fine for winter. Get a pair of overmitts if it's going to be properly cold - better to be too warm than too cold in winter because at least you can remove a layer!!
Finally - hat, scarf and gloves is a must. If it's going to be sunny, get a pair of Cat 4 glacier glasses to prevent snow blindness (look at Julbo as a manufacturer for example). It's surprising just how bad the glare is on snow in the sun.
On your basket - Berghaus Benvane won't be warm enough. Just get a down jacket with a separate shell if you really need one. Alternatively, if you're concerned about it getting wet, something like a Rab Photon Belay jacket would be ideal as it's sythetic so doesn't mind the rain too much. Bear in mind that the activities you mention aren't particularly physical, so you need to imagine you're standing still for hours on end and should dress accordingly.
And enjoy it!!!
