I have used the SB13 (5" version) but I have heard this woofer paired with a Dayton RS28a tweet in a sealed (12L IIRC) and I was impressed by both. They will go low but not too loud bc of limited Xmax but are easy to work with and sound very natural due to the paper cone. Only drawback is flush mounting the pin-cushion frame IMO.
I would probably spend the extra and get the SB17. Nicer (and round) cast frame, much better motor (Le is way lower), doesn't have a resonance issue just above 1kHz (blip in impedance and wiggle in frequency response).
Dayton RS180 has cleaner bass than an SB17, but the (upper) midrange isn't quite as good. I'd tend to use an RS180 in a 3-way and the SB17 in a 2-way (with subwoofer).
The next cheapest i'd go is the DA175-8. Similar bass cleanliness to an SB17, similar midrange to an RS180, half the price of both.
I have used the SB13 several times, very nice woofer that needs a notch. The cones of these are different from each other, the papyrus fibers are non-evenly spread so ask the vendor to select a pair for you