Hi Cbrown. Welcome!
There is no reason why you cannot get a Bengal - It will probably adapt quickly to sleeping when you are at work, and will expect more interaction and play when you are home. Is that something you can do?
I work shifts and have had my boy for nearly 6 years now, (He's nearly 15) and he does whatever he wants when I am out at work, but is always around when I am home, or on my rest days... demanding cuddles, play or attention of some sort.
You haven't said how old the resident cat is - If you were to introduce a kitten it would be pretty hyper and may upset your older cat. Is this something you can provision for? You may need to look at re-homing the kitten if they didn't get on as it would not be fair to push the older cat out due to an interloper!
What about when your other cat passes on - Would you look to get another playmate for the Bengal as it will be used to company? These are all things you will need to consider.
Whatever you decide, lurk here and learn loads, because it will help you cope with the mayhem you are setting yourself up for as a Begal owner....