If you switch to TSS, you won't need to buy any new choke tubes. TSS will create stunning patterns from your
"generic extra full" choke tube as well as from a flush full choke tube. It is very forgiving of choke constriction unless you choke it too tightly. Best hunting patterns in the 12 ga usually come from choke tubes from .675 to .690. The plain Jane Remington XF tube is .687 and should do fine.
Or...you can spend several hundred dollars on half dozen after market choke tubes and any shell besides TSS, but you will have a hard time equaling a TSS load from a factory full choke.