No point in grading the non-holos, or even most of the rares to be honest. If it were a complete first edition shadowless base set, then it would definitely be worth grading the entire set. However, the unlimited base set just isn't rare enough (at least to me) to warrant grading every card in the set. Now, I would definitely suggest grading the holos like Trader said, as those can be worth quite a bit as long as they grade a 9 or 10.
As for the price of the complete set, you could expect a couple hundred for a non-graded set. A full PSA 10 set is hard to put a price tag on, as only a handful of collectors would be willing to dish out the cash for a set like that. Not to mention that a set like that has probably never hit the market, at least not that I am aware of.