If you plan on buying a full set of collets, buy the Beall chuck, the price ends up being the same in the end.
Example:
PSI chuck with 5 collets: $72.36 (Amazon)
Apprentice Chuck with 5 collets: $89.90 (CraftSupplies)
Beall chuck with no collets: $82.90 (CraftSupplies)
Collet set 18pcs fractional: $120.84 (ebay)
PSI chuck plus collet set: $193.20
Apprentice chuck plus collet set: $210.74
Beall chuck plus collet set: $203.74
The difference is with the Beall chuck you get no collets and with the PSI and Apprentice chucks you get 5 collets in 1/4", 3/8", 1/2", 5/8", 3/4" sizes.
If you don't plan on ordering a full set of collets and price is your main consideration then get the PSI or Apprentice set. If you are planning on ordering a full set of collets why not get the Beall chuck? You only save $7 buy ordering the PSI, and end up having 5 redundant collets kicking around the shop.