Well a better question would be which models don't I want. I am not interested in the .45 GAP cartridge at all. Also I don't think I would go with any of the sub-compacts either. Other than that I pretty much would like to have every model (although there is this thing called money).
I also would like to see Glock add some more calibers such as the 5.7 and the 7.62x25. Also maybe a magnum glock might be cool for calibers such as .357 and .44 mag.