A set of new decals will cost you around 30 Euro including shipment, you can take that into account. Blizzards are cool (I have a few) and sought after but mainly the earlier versions (pre 94). Usually on Ebay they go for anything between EUR120 and EUR220, depending on the condition and how badly someone wants it. Yours I would rate more in the EUR120 area since it's missing the original decals. Mint versions can sometimes hit higher prices.
Anyway, that's my opinion and of course if you're able to find someone who is willing to pay EUR450 for it, go for it! If it's realistic, that's another story.