Your exactly square room might pose a significant challenge for you, and perhaps room treatments would be your best use of funds to improve things.
That said, the Staafs can image very well (although the Arro's really are the imaging champs in Totem's lineup). They key in my experience, though, like the Arro's they really need tubes to sound their best. (Fortunately, it doesn't have to be expensive; the best mating I've heard with the Arro's, for instance, is the Jolida 302b.) And spend some time fine-tuning the placement of the speakers relative to the listening position.
They aren't the last word in bass extension, as you mention. A sub really is needed here, but that could also be said for the majority of monitors that you are comparing to the Staafs.
It's been a while since I've heard the Staaf's, but I don't recall their midrange being a problem. That said, if you like the sound of your LSA1 monitors better, then you've answered your own question as to which you should keep.
Michael
That said, the Staafs can image very well (although the Arro's really are the imaging champs in Totem's lineup). They key in my experience, though, like the Arro's they really need tubes to sound their best. (Fortunately, it doesn't have to be expensive; the best mating I've heard with the Arro's, for instance, is the Jolida 302b.) And spend some time fine-tuning the placement of the speakers relative to the listening position.
They aren't the last word in bass extension, as you mention. A sub really is needed here, but that could also be said for the majority of monitors that you are comparing to the Staafs.
It's been a while since I've heard the Staaf's, but I don't recall their midrange being a problem. That said, if you like the sound of your LSA1 monitors better, then you've answered your own question as to which you should keep.
Michael