I'm riding a Schwinn GTX 2 and using it to learn things on. I am new to fixing newer bikes. I've changed to Altus front and rear derailleurs. Now I'm about to put on a gearset of the same. I've got the new 3 speed crank, I'm just waiting on the new bottom bracket to install.
Question: Should I go with a 7 or an 8 speed cassette on the rear? An 8-speed will take a new shifter, but those are coming anyway. Is it worth it to go for the extra gear, or am I going overboard?