yes i agree with tony don't need for expensive stuff just buy good quality it last longer, if you look around and read the fabriks info you even can compare , even when not expierenced
an example silly maybe but almost the same : everyone knows a car with 1600 16V car will useless fuel than a V6 or V8 mustang ... that's what i try to say llok at the fabrications specs on the net compare prices a pick up the best with the lowest price , that how i do it
another thing also for tankmodelling try scratchbuilding it saves you a hell off a lot money, thats also modelling, buying everything can everyone can do that you don't need skills to put new things onand is not as satesfied and rewarding as making upgrades by yourself, i mean on the body off your tank, to make electral or mechanic stuff am not gifted enough ...