The Forte's will easily be driven by a 10w SET and many enjoy rolling 300Bs though it is not an inexpensive hobby. You will find their are a surprising number of new 300Bs available that sound quite different.
I am not sure what the benefit of a KT 66-KT150 amp would be as you don't need the power. The only benefit would be the opportunity to roll relatively inexpensive tubes rather than the pricier 300Bs.
Picking the exact SET (PX25, 300B, 845, etc...) to get the right sound profile for your taste is probably an interesting place to start. 300Bs will give you most flexibility for Tube rolling but have a specific sound profile that may or may not appeal to you.
I am not sure what the benefit of a KT 66-KT150 amp would be as you don't need the power. The only benefit would be the opportunity to roll relatively inexpensive tubes rather than the pricier 300Bs.
Picking the exact SET (PX25, 300B, 845, etc...) to get the right sound profile for your taste is probably an interesting place to start. 300Bs will give you most flexibility for Tube rolling but have a specific sound profile that may or may not appeal to you.