While i am a novice with the bengal breed and have only had my bengal for a week, i have had cats my entire life which have been used to living in a household where everyone has been out of the house pretty much 8-5. Not just moggies either, but burmese & siamese as well. The burmese i wouldn't really compare as they are pretty chilled out in comparison to a bengal but i would say our siamese (Neo) is pretty similar.
I think since Neo has always been used to the fact that we are out during the day, she has adapted to that way of life. She's getting older now (nearly 11!) so she has slowed down a bit but even when she was very little, so long as we rotated toys for her in the day and played with her alot when we were home, she was and still is a very happy cat.
We currently only have one bengal boy who is at home while we are at work, like i said he is very young so we have yet to see how its going to work out (i.e. whether we will need to get another cat to keep him company)but currently we have a little toy rotation going on so he doesn't get bored with the things he can play with during the day, we will be hiding treats around the house once he is a little older, he gets at least an hour of play and attention before work in the morning and once we get home at about 5-5.30 he gets all the attention he wants up until bed time.
My sister also has a bengal / siamese cross (what a combination :S) who is now nearly 2. My sister and her husband are also out all day but use similar tactics as the ones we are putting in place and he is also more than happy.
If you are willing to put in the time and make a large effort to supply him with a variety of activities during the day, i do think you could have a happy bengal. However, if you have any doubts of whether you will be able to provide your new furball with this amount of attention, then maybe keep your cat plans on hold and save for a little longer until you can have two