In Feb, the major things to watch for are Mardi Gras, President's Day weekend, and the Princess Half. So, for next year:
Mardi Gras: Tuesday 2/13, much earlier than this year, which was 2/28
President's Day: Monday 2/19
Princess Half: Thursday 2/22 - Sunday 2/25 (crowds tend to grow towards Sunday)
I went President's Day weekend this year and my wife went the following weekend for the Princess Half. Both were relatively 'stout' rate wise. Discounts could be hard to come by around the Half dates, so watch out for that.
I found the President's Day weekend crowds pretty high but manageable. No worse or better than 'spring break' to some extent.
I would vote for the following week if possible, but I would totally go that President's Day week if that's your only option too. Any week at WDW is better than a week at home!

Have fun!