Get the weapon, farm Alex for i190 chest. Then buy pieces that get you close to accuracy cap. From what I've seen as a SMN in i190 gear we are way over accuracy. Unless it's a huge accuracy burden, either to much or below cap, I go ring first. It's cheap and usually biggest upgrade that can't be gained easily somewhere else.

BTW who knows what relic weapons will take. It could be a huge grind and/or huge hill sink. Do we even know what the stats are?