Patrick, if you have the 55 you don't really need the 50/1.4 ... yet
Excellent Takumar lenses: the 35/3.5 and 28/3.5 both - the 35 is better but 28 is wider.
On the longer side, the 85 is well-appreciated (both in esteem and in $$), the 105 is excellent and can be had for less, and the 135 is ubiquitous and can be had cheap.
Outside of Takumar, if you luck into some Yashinons, great! Vivitars are all at least decent. Another way to go is to get an M42/Pentax screw mount (or Fujica screw, they are all the same on a Spottie) adaptall-2 and then the whole world of Tamron Adaptalls is open.