i cannot speak to the availability of parts, but i can tell you that if you like the older N5, you will LOVE the N5C TT!!!!
i just put 3 flights on mine this morning, she is a wonderful bird!!!!! it is lighter than the older bird too! the TT is great, extremely strong gears, i only strip them when i crash, and even then i usually on get the large spur gear and maybe one other one.....very robust!