The dart heads are a no brainer at 465 each its not a bad price for an ***. head. They are ready to bolt on and go.
Redoing the heads is not always practicle. In my local area machine work is not cheap. But if you got a friend of a friend you can call in a favor for them maybe it will work out to be cheaper but the dart heads are going to make more power than rebuilt heads. So in the end if your not getting the heads done for less than 500 its going to be better to spend the 900 on the upgraded heads. But depends on your budget. also dont forget summit is usally not the cheapest place to buy heads.