My guess, a stock S90ES (depending on condition) is worth between $700 and $1.2k. The 3 cards are worth about $225 a piece, maybe $600 for all 3. The firewire card is not worth much because it's firewire and driver support has ended. So maybe your loaded S90ES is worth about $1300 package deal. If you were successful selling it off in pieces you might get $1675 in the end.
The problem with the 100P is that you won't get strong bass performance at high sound levels with 10" drivers. For low or moderate power, you can EQ the bass to some degree to get good sound, but you really need a 15" driver for strong bass.
I recommend the Peavey PR15N passive speakers with a powered mixer or a mixer and power amp. The PR15N have good bass performance at a value price, use neodymium drivers for good power at a reasonably light weight, and the cabs are extremely durable polyprop. The next step up in price is the Impulse 1015, which use the same cabs with upgraded components such as BlackWidow drivers. With the Impulse 1015 you would need to drive them with a much more powerful amplifer than needed for the PR15.
Strong bass isn't only good for arena rock. A quality grand piano sample requires a 15" speaker to reproduce the bass notes without a significant rolloff at higher volumes. It really is a matter of physics, because a concert grand A0 note is 27.5Hz, and to reproduce that efficiently requires an 18" folded-horn cab that most people wouldn't want to haul around to gig. But short of bringing in a real concert grand, that's what you need to get down below 30Hz. A 15" main is a good compromise for sound quality and size, and the PR15 is a good model at a value price. However, a 12" main might work for you if you aren't hitting the low end of the scale, and you can figure that the bass will start dropping like a rock below 70Hz. The bass on a 10" speaker just won't be there. If you want to feel it, you need the larger drivers to push the air. The cone of a 15" has about 3 times the volume of a 10".
My reply above was a bit too simplistic, and Bad_Mister was clarifying the situation. Physically, you can daisy chain your FW devices without concern. However, of you want an application to work simultaneously with all the daisy-chained devices, the driver has to be compatible with all of them.
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