I started to make a healer...

Production level 7
Strk 6
Rng 0
Tech 1
Armor 0

I read online its like 11 strk 9 tech something like that but I think it'd be more enjoyable if my partner bot was out there kicking ass with me and I could load up on dimates and trimates anyway. Right now I'm level 20, ive given my bots stats. Meseta isn't a problem, so doing a bunch of C rank missions and picking up swords seems like the slower less ideal option, right? What are the best things to just buy, or should I not waste my meseta? (I have 15M)