I recently bought several balls and ultimately decided to go with Hammer. I have had success with Hammer in the past and for me the way Hammer rolls has always been consistent and reliable.
With that said, I usually like throwing older equipment because it's a cheaper way to invest in your bowling without going broke.
I currently have...
Hammer Cobalt Blue Vibe
Hammer Raw Hammer Doom
Hammer Vicious
Hammer Hawg
I believe I have a great 4 ball arsenal to start. I am really hoping to find a Raw Hammer Pain. Other than that, am I missing something here? For my spares I just flatten my wrist and throw my strike ball so I am not worried about a spare ball.