First off I am a die hard cloth diaper lover and even then there were periods of time when I used sposies for my own sanity. Each time it was just the break I needed to re-discover my love of cloth.
So if it's what you need in short term go with it. Finances do make that more difficult tho.... Could you go with a cheaper sposie in the short term than the pull ups? That might buy you more time or save on the costs. At least here pull ups are ridiculously more expensive than regular sposies.