if the shop is reasonably good [i have no qualms about using your shop], and they use quality rebuilder components, that is about as good a deal as you can get.

I have a local shop that sold me the Sun gear and planetaries a few years back for $50.

Not worth the effort IMO.

May not be worth the effort if you keep the 4.56:1 gears in the rear.... But if you replace the 4.56's with some 4.10:1's the net effect in first gear is about the same but your 3rd gear run is much lower RPM. Very much worth the effort for a daily driver that races on week ends.
(4.88/2.45)*2.74=5.46
(4.56/2.45)*2.74=4.07
(3.91/2.45)*2.74=4.37
(3.55/2.45)*2.74=3.97
(2.76/2.45)*2.74=3.08
(2.20/2.45)*2.74=2.46

So done as a package deal is where you get the net worth.