Hi Shakeeb,
I don't understand your question very well, but I will try clarify some points.
You don't need a Nexus 2000 if you have enough ports available in your Nexus 5500, even if you will use nexus 1000v.
In this scenario what I recommend to you is connect the both Nexus 5548 each other and create a vpc with upstreams routers and downstream blades and storage.
Richard