I believe it's important to consider prison as rehabilitation, not as vengeance. The tone of your consideration makes it clear that you'd want him in jail only for vengeance - it's not up to you to "be okay" with the offender's sentence. All that matters is that it is appropriate.
Depending on the prison, I would be okay with a criminal spending only five years for every degree of murder save for first degree.
I can assure you, you'll get over your bank account being empty. Yes, I know, you could lose a substantial amount of money. But there is insurance for these sorts of things (despite it not being foolproof), and I don't think you fully consider how five years of prison can change you.