The "certified" G3X is the Garmin TXi. Garmin most likely will never offer a certified G3X. I don't mind coming back to this thread after S-n-F or OSH this year or next to prove it.
@airbuspilot2436. I had a planel like yours in my 231 with dual 430s and jumped up to a GTN 750 + GTX 345 - that was enough for me for a long time. My suggestion is map our your budget all the way to unlimited and start with a much as you can afford. The more you can do at once, the (marginal) cheaper it will be by going into surgery more than once.
Here is what I would do (in order) in your panel:
1) it looks like you have an EDM 700 or 800 today. For probably around 1AMU you can upgrade it to a full-color EDM 830, reuse most of your probes and add the onese you are missing. Contact @Aerodon and he can help you get started. I did this on my current 252 a year ago. Much easier to see the values without all the scrolling. Also as part of this, remove the ADF. If you can afford the EDM 900, it is probably $8000 installed and will replace all your engine insturments.
2) I would go with a IFD440 as a slide-in replacement for one (or both) of your 430s... or just leave them in. If you have more budget, the GTN 750 is amazing. I won't own another plane without it. Every 6 months that come out with a new feature that is normally a big step forward. The downside it is larger (panel space) and expensive vs some of the other options but for me it is worth it. You can remote your transponder and audio panel to save space.
3) After you decide to either keep your 430s or upgrade to an IFD or GTN, then do a dual Aspen MAX or TXi and get ride of all the steam gauges. This is the step I am on now in my 252.
4) Autopilot. It appears you might have a KFC 200. What you choose here will afect #2 or #3... or vice versa. Ripping out the old and installing a new is going to be expensive. Myself am still on a KFC 150 but it is working very well and I also have altitude preselect with a yaw dampener.
Again my thoughts for what it is worth. Don't wait "wishing" for something to happen. Decide you want it (or need it) and take the plunge. There will always be something new come out in the future. Those who wait are probably still waiting and will be.