Reply to The 25 Key Debate!

Hi I am currently in the process of saving up for my first midi keyboard, I have done tons of research for the past week and decided wholeheartedly on the Novation Impulse, and either an APC 40 or a Maschine (huge debate here also)
My only question remaining is how many keys do I get, 25 or 49? I will only be producing with it, I will be making bass heavy music: drum'n'bass, moombahcore, glitch hip, breaks so no need to be able to play two sections of the song at once (melody and harmony, etc) Given this information will a 25 key suite my purposes or is ridiculous to believe i can get away with writing full length sonic masterpieces filled with insane computer sounds and the occasional soul-lifting, mood-elevating riff to keep your emotions both interested and changing Thanks for your time everybody!!