I have a switch tester with MX Tactile Gray and MX Clear, but I have not tried a full keyboard with either. I recently built a keyboard with 67g Zealios. As far as individual key feel goes, I'd say the Zealio is right between them in terms of tactility, but a lot smoother. I usually prefer heavier switches myself, but, IIRC, the 78g Zealios are heavier but not as tactile. I have not tried finding tactile grays, but Zealios might be easier for you to source if you're willing to solder.
As far as keyboard choice goes, I'd say get whatever looks cool to you. There's not really a lot of difference in consumer keyboards in terms of features. I personally hate media keys and lighting modes other than on and off; what else is there besides programmability and build quality? It's not often that there are fullsize GBs as far as I can tell, so, if you're looking for a hefty metal custom, TKL is probably as big as you'll get.
That said, the best switch I've found so far is buckling spring. Nothing really compares to it (if you get a good specimen), but it's really loud, and you can't really customize IBM keyboards with fun colors and keycaps.