the jl audio 10w7 and 13w6v2 both go for around $360 on ebay... which will go better with the 500/1. also for half the price would it be better to go with a 12 inch RE SE??
they are a great deal. Although the subs you are comparing are not in the same league. The w6v2 doesnt compare to the re se the re se is more of a comparison to the w3.
this is kind of funny because I was just sitting down thinking about what sub I wanted to run next and I am going to run a 13w6v2 off of a 500/1. I am not saying you should do this but if you do it I would prob put my left nut on it that you wouldnt be unhappy. I would run the w6 over every other option you have mentioned.
i have a few weeks to decide buti am leaning towards the 136w or the 15v3v2 both would be in a sealed box. with a 500/1. right now i have a kenwood 628 head unit but im hoping to get a new one soon.