Pass labs int60 vs 150.8 + He9

Hey guys I want to buy one of these pass labs units. The 150.8 is like $500 usd cheaper  (buying used units). I already have an audio gd he9 which I will upgrade at some point in the future. Should I got 150.8 now and see how it sounds and upgrade pre in the future (I think he9 is really good imo). Or should I get int60 so I can get all pass experience in my chain?
Speakers ns5000.