Hi,
50 pounders seem to be the way to go these days.Injectors don't get that bad with age,but that'll put another set of 42s on ebay. Somebody will use them...
Since you started modding the car, chances are good, you aren't going to stop. I would tell anyone even touching the injectors to go 60/65 lb. I changed to 60/65s with the Extender chip and it ran like stock even with the stock turbo. I added all of these mods and the injectors still aren't done even at 480-490 MAF readings in 35 degree temps outside.