Audiobahn vs. Db Drive?

I have 2 of the awis-15 audiobahn immortals, and they are very SPL-based in the response, much like a DD9515. I've been told that the two subs are very similar b/c audiobahn ripped off the moto design. But anyhow, other people say the immortals suck just because audiobahn doesn't make anything good.  Whatever, all I want is good sound for no money. Isn't that typical...lol. Everyone says "Get a brahma and an xxx" but I have no money. I want something to take like 1200 RMS but not be $400 a sub, you know? I've heard about the Db Drive Platinum subs, and I ran the t/s through WinISD Pro, and it says that tehy will perform similar to the xxxs or brahmas. Although, it won't move nearly as much :(. But I have room for about 5 cu. ft. per sub, so I want 15s, and the PL15D4s would be perfect. They are veryvery inexpensive too, but that almost makes me worry. You can pick up these things from millionbuy.com for like $150, and the immortals on there are like $550. That makes me wonder. Makes me think I should stick with what I got. I've heard the dB Drives are LOUD, and I've personally heard the 12s, and WOW. But, I want to ask people with knowledge... you know. Or 15s that'll do like 1200 all day long without giveing me a problem that are like $200-275 a piece shipped.  3 12s or whatever would work... just good noise, I said 15s because 2 15s are usually cheaper than 3 12s. Let me know. Thanks!

Tempest hits really good and they arent over 200 a sub.  They also have plans for free on a loaded horn box.  One of those is all you'd need.