Why not buy all of them?? For how much it will cost you got them all so nobody else could buy them as that would be a nightmare if another company had a near identical name selling either the same stuff or something a bit silly.
Try with estibot to valuate these domains. It'll break the domain names in to keywords and returns the current valuation. I recommend you to choose the one with a higher valuation for the moment since its giving ample space to grow business in two ways.
1. Easy to remember domain name would return many users
2. This is like acquiring a land, you have to make sure which is the best address in terms of value and having the right potential grow it gradually