Yes mixing light and heavy gear can be a key option, but there is quite a few heavy hitters in br lvl14 arena ( myself included ). That extra defence may be missed, but then again.. with the right stats you may just find a balance.
But here's the pincher, 44k will not fully set you up.
Your looking at 3-10k per equipment piece and a weapon just might just blow your whole budget.
Not to mention that lvl13 gears are at an all time low at this point in time, not many people are farming for them. ( br server that is ).