If you are looking at buying something, that suggests you are trying to get it off of the Marketboard. Checking your Lodestone profile reinforces this, as your Blacksmith level is very low and your Armorer level is also low.

TC, I'd take a long hard look at the differences between the HQ crafted i170 MH tool and the red scrip bought i180 tool, factoring in how you intend to meld. Then I'd get BSM to 50 and ARM to 60 before trying to make the frying pan, if you decide on the i170 tool.

Personally, unless and until Tier V Materia become readily available (as readily available as Tier IV Materia are now) I cannot see the i170 piece being better, but that is a decision you have to make for yourself, on a piece-by-piece basis.