Title says it all. The stock 10" gives a nice crunch of it's own and has a raging mid range. Are there drivers out there that do what it does even better?
Rajun Cajun gets a ton of recommendations for small fender combos.
That , and Weber make a lot of good 10" speakers. I've even heard that the Alnico 10 signature speakers are even really great speakers at like $45 a pop. Warm and "reed-y" with some breakup. Should bring out some tweedyness.
just hearsay but both of those should be a great starting point I think. hope that helps.