My first suggestion is to get a gym membership. It isn't as expensive as you think. Alot of gym offer corperate rates if you work for certain companies or discounts for students, etc. Since you didn't say how cheap the bowflex is, we can assume used it is at least $500. That will buy you at least a 1 year membership at worst. A commercial gym will give you access to alot more equipment than you could afford or even have space for. Plus you have the social aspect. Not only is it a good place to meet people and for social interaction, but it can be motivating. Humans are social animals. Most of us will be more motivated to train harder and more consistant if we have others around. Also, it can form a support group. Most of my workouts are set at scheduled times, so the other bodybuilds, and the fitness chicks, who frequint the gym at that particular time and day will know if I skip a workout, and will ask me about it next time they see me. "Were you sick? Did something come up? Did you just not feel like coming?" Especially helpful for cutting because I'll be inthe gym twice a day. The other serious trainers will know what I'm doing because we all talk with one another, and will start expecting to see me there at that time. These types of people will also be there to help spot you, and encourage you to push harder and give 100%. These type of social interactions will help make for a better body.
Now, the bowflex is a fine machine, but within a matter of months, if you train very hard, you'll platau on it. You are much better off with a power rack/bench/olympi set. You can always buy more weight as you grow stronger, and can add an adjustable dumbell set, extra bars for doing partials and pins, dipping bars, a chinup bar, etc. There is no reason one cannot build an impressive, and quite large, musculature with some basic equipment at home, but I still recommend a gym.