I guess it depends upon what you want.

BTW: I forgot to add IPD overload rear springs to my mod list...

The mods I have mentioned do not change the looks of the car, i.e. do not lower it. The Bilsteins and heavier rear springs actually raise it a tiny bit.

And I 'd have to say from the factory they are more concerned about a safe setup for mom's and grocery getters that having the car truly balanced out. A stock 240 is setup with serious understeer. Once you get above 40 mph you really have to push a 245 into a corner...

And I would think that mods would be a selling point if you went to sell the car. Once the mods were made why would you ever want to convert it back to stock? A properly modded 240 drives a lot better than stock and stock 240's are not a huge collectible like a VW, Mercedes, Porsche, etc.

Read the Grimshaw book if you get a chance.
Even better would be if you were able to drive a 245 with some mods done to it.

Anyway, have fun and good luck!