What are the strong points and weak points of the Neutron and what direction are you looking to go in with your set-up?
There are lots of directions you can go if you're looking to beef up your Neutron.
The Neutron has a lot of great basic circuits on it.
The one thing I would suggest would be an output module capable of stereo line-level outputs. Eurorack level is a lot hotter than line level so you may (or may not) have issues if the audio path terminates in your rack rather than the line level output of the Neutron.
The Neutron lacks effects except for the delay. So you can stretch things quite a bit with a wavefolder or a swarm generator. Effects like reverb, chorus, and the standard lot that have CV modulation go a long way as well... check out the Tip Top Z-DSP as far as effects generation. It works off of hot-swappable cards. So you get a wide palette to choose from if you buy additional cards for it.
A third oscillator is always a welcomed addition as well.
There's nothing wrong with any of the kit you've selected (including your Intellijel wavefolder). The Disting is a nice sampler-plate of different functionality. So if you have your case and an output module, I'd get those plus the Disting and have a play for a couple of weeks and see what tickles your fancy before purchasing the rest of the lot. But that's my opinion. :)