Op FI q or ssa xcon re your best choices
both much better sub than the w7 whether or not same price or not
Fi Q Series Sub Woofers | Fi Q Subwoofer
but xcon is over 400 so I would say your best choice is the fi q massive sub for an amazing price
if you can fit a 18 this is also a great deal, i would only do an 18 if you have an suv
Re Audio® SX18 D2 18" DVC 2 Ohm SX Series Car Audio Subwoofer Sub SX 18 SX18 New 611892990371 | eBay
image dynamics ID MAX subwoofers. or go nuts and pick up some critical mass UL 12's
Leaving out the price, the w7 is in a league of it's own, (if you have the money and it fits your goal, then buy it). When comparing power, sq and output, it is very difficult to compare other subs to it side by side, hence, there is always going to be a trade off !
I like the used Xcon idea. ;)
ive seen used UL's go for 5-550. not that far off his price for the ultimate essque woofer
Hdc3s, Hdc4s etc......