correct. pi2 requires a usb wifi card.
pi3 had a pretty big boost in performance as well, but as a music server/storage server.. pi2 works great... wired in. I also have it running a small lcd display.. basically all that tinker type stuff can be done on the pi2.
glad you are having fun with it!
sweet! In the end why change it if it works well :) have a good one buddy!