Neronian: If you purchased your speakers from a dealer and they will allow you to trade up this would be the simplest way to go (granted that you like the sound of the GP's that are definitely not shy in the bass department IMO). You would spend at least the difference between the two speakers on a sub without necessarily achieving better synergy. I assume that you have exhausted all speaker placement options as well as room treatments that you are willing to do. Placement and treatments can have a major impact on bass. For example we just cleared a pile of clutter out of a corner in our livingroom, which resulted in an increase in bass response from my mini monitors. IC's and cables also impact bass "fullness" to some extent.
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