I would just drive it as it is, save the money for another set of track tires
I drove my 92 AWD in the winter (16g, 50, and 60 trims) with what ever crappy tires I had. I have driven in 7 MN winters so far, never bought snow tires, never got into an accident, and never got stuck.
My winter car is my DD Honda insight which has the smallest tires you will find and has to be one of the lightest cars as it is pretty much an aluminum CRX chassis. I have driven this car for 2 winters. I don't see how the EVO could be any worse.
Driving in the snow/MN winter is typically only different if you are driving while it is snowing as the plows do a pretty good job of keeping the roads clean. I can come and go as I please at work so I can arrange my drive if I want though...
I can't see the EVO being an issue as it sits. I would go with it as is, it is always easy to buy another car or a set of tires if you are unsatisfied.