There are two forces at play here, one is ergonomics and the other is aerodynamics. Ergo wise, your wrists should be straight into the grips with the bar at 90 degrees to our forearm. you don't want your wrists to bend when you are in your riding position. Aero wise is a little more difficult. The riding position should be 'tuned' to the most common speed you ride at. The goal is to minimize the weight or conversely the pull on your arms. Upright wide bars work for slower speeds. At slow speeds your arms are only holding the bars, but as you go faster you will need to 'hang on' against the wind blast. Bringing your arms closer together will reduce the size of your body 'sail' and leaning forward will balance against the wind blast. Clubman and clipon handlebars are intended for high speed riding. Everybody is different, I find the European style bars from the CB400F work great for my 450. I ride mostly secondary roads, when I get on the freeway I can slide back on the seat a little and this puts more weight on my arms. Around town I slide as far forward as possible on the seat. My GL1200 has the full fairing and that allows me to sit upright at all speeds. The GL1100 will be naked and it has the stock tall bars. I have seen European style bars on the GL1000. These principals will apply to the 1100 bar selection.