788'S are decent rifles that have unfortunately gotten over-priced due to demand. $350 is a good price on today's market - no way would I pay $500 for one. I'd grab that one in a hurry if it is in good shape.
All I've ever shot have been accurate for a factory sporter. The detachable magazine is a big plus for me, I like to be able to load and unload completely and quietly.
They are a bit on the heavy side, that may be something for you to consider with the younguns.
I'm kind of partial to them though so I may be biased....