Transformer upgrades aren't that expensive. You can use them to allow most of the IC machines to work without needing to worry about the transformers. Most of the machines operate on LV (32 EU/t), if you add 1 transformer upgrade the machine will work on LV or MV (128 EU/t) and if you add a 2nd transformer upgrade it'll work on LV, MV or HV (512 EU/t). Just be sure to install the transformers BEFORE connecting them to the power grid. Also be sure not to remove the transformer upgrades from the machines while they are connected to a MV/HV power grid.