i think it's normal to think the price may go to below $400 levels as bitcoin has surprised many of us plenty of times already. i think this month we'll make an attempt to reach $450 as we're heading towards the block halving. but then again, i don't think we will be able to hold $450 for long as the price will get dumped down again.
Why $450? Has there been a lot of buying around $450? Apart from that possibility, I'm not seeing anything about $450 that suggests there'll be resistance - the only significance I can see is that the last peak reached $450 - but that was in the context of lower peaks, higher troughs.
I expect resistance around $500, however, due to the November high.