The Bowflex sux. I just sold my PowerPro XLT because the movement, motion and resistance were anything but sufficient. On top of that, the construction quality is far from the $2000 (fully loaded) price tag it boasts. I wouldn't pay more than $300 for the entire thing. That $999 version posted earlier is just the upper portion of the unit. If you ad the lat-pull down, squat, bench, leg extension and flexion units, you will see it skyrocket to almost $2k.
IMO, free weights are the way to go. you can't get the same workout from something that follows the same path in a repeated motion. This doesn't work out the supporting muscles. Free weights not only work the muscle you are trying to, but also all the other muscles that help support and balance the movement. That is how you would use them in the real world anyway. Get yourself a nice olimpic free weight set.