Front port, in and of itself, does not necessarily mean loss of "punch," and certainly not with PMC. So the GB1i might make you happy, but other posters are correct that only a home test will tell for sure. That said, it looks like you do not have much flexibility on speaker placement, so if the PMC wanted to move around to sound its best in the bass, query if you have the space. Also, that particular PMC, although a floor stander, has a pretty small driver, so I'm guessing bass has its limits in any event (I am not experienced with that particular model). All of that said, have you considered adding a sub? Can be very effective indeed when integrated correctly with monitors (but does take a bit of work). To me as I look at your system, I'm thinking add a sub with the monitors, or, get floor standers with more muscle power than the GB1i. How about OB1i?