2000 Pontiac Montana rebuild advice

I already spent $500 on doing the heads just to find out that a rod bearing was the problem all along. So now I pull the bottom end down and find everything pretty good except one rod bearing, I have a few questions. I want to know if I can get by with just installing new bearing inserts?(Crank looks good but I plan on plasti gauging). Should I also install new main bearings? (Should I use emory on crank? All but one main and one rod journal are smooth, main had grooves running the diameter, rod journal is slightly discolored, or should I go ahead and have it turned?) And should I go ahead and hone the cylinder walls and re-ring it too?(No lip at top of cylinder walls and walls look good)and of course I am going to put all new seals in. Parts are surprisingly cheap, about 150-200 will do it all(except machine work of course. I am trying to get another couple years out of this van, and It ran like a top and has been a great car otherwise or I would not even bother, I would appreciate any good advice. Thanks