There are some things to consider before you choose arrows. What kind of bow is it? The make and model tells us a little about the performance which affects spine requirements.

Is it fast, center cut? This info will also help in the determination of what spine would be indicated. Fast/center cut bows need stiffer arrows.

What is your draw length? You told us that the bow is 60" at 28. Do you pull 28?" A useable rule of thumb is that actual poundage increases/decreases 3 pounds for ever inch of draw up or down from 28 inches. This tells us about poundage and arrow length which enters into the spine discussion.

Hope this helps.