I, too, think you overpaid. However, you are happy with it.
The real question is how are you going to properly port those BL 15s in a Caddy? Maybe you can do it, and I'm not suggesting it can't be done, but it just seems like it will be tough.
And secondly, I'm sure you were unaware that while the rms rating for the BL is 1500 watts, there are many reviews that suggest they need around 2kw a piece to get moving well. I would have suggested a pair of SSD 15s with BP power if you want to get loud with around 1200 a sub and go with Fi. Would have also saved you a bit of coin.