► it would also be better if you have the chance to test it at the store, comparing..
► and regardless of brand, just look for the word "HiFi" and "woofer" to keep you on the right track..
► i also suggest a "200W rms" rated power..
► now the impedance "Ω" will depends entirely on the amplifier → when it says 4Ω → then i suggest just follow it, don't get too low @ 2Ω nor too high @ 8Ω..
► i also suggest a softer surround for sweet low-ends..
At your service!
-Emil