$2800 would appear too good to be true, but we assess the quotes before those additional Vic rebates. $6500 isn’t too good to be true. However, it’s important to know which QCELLS model they are selling here. QCells annoyingly has a lot of models currently available, with vast differences in price.
Option 2 seems pretty reasonably too.
Who are these quotes from? I believe Velocity and Future Friendly are both pretty reputable operators down your way.