I say "Yes" and "All four tires."
$900 (assuming you buy separate rims, TPMS, and a quality tire) is a small investment for a new car. Plus, they’ll last you a couple of winters – which will extend the life of your current tires! I just bought my set 2 days ago.
My last car was an SUV with 4x4 (all-season tires); I rarely had problems getting going / out of the snow because of it, being that my car was so heavy I didn’t encounter many problems with braking, handling, hydroplaning, etc. While the two front tires will help you move, handling will be hurt without rear tires (think tokyo drift) – in addition, all cars have 4x4 braking, which is why you really need winter tires.
After spinning 360 degrees in my parents' ZX5 in all-season tires while turning at 7 mph, I figured I should buy some winter tires.