Mx is the perfect machine then IMO.
The only issue you may have is the plow. Because it varies so much based on dirt type, plow type, tire type, and plow size. And all you said was 3-bottom.
3-12's is probably fine with an mx and r4 tires.
3-14 you probably gonna want ag tires for sure and tire ballast wouldn't hurt.
3-16 is what I have. And it's pretty much the max with R1's, loaded tires, PLUS 300# wheel weighs per wheel. Any slight hills or ever so slightly too wet and it will slip a little more than I want. But does a fantastic job if the conditions are just right.
2-row planter, 2-row cultivator are child's play for the mx. That's the stuff ran behind old 8n tractors with half the HP, 1/3 less weight, and 2wd.
7' tiller is perfect match to the MX