You're going to need an amp that will push 1000 - 1500 rms at 3 ohms. There really isnt going to be an inexpensive amp that is going to do that. The sub can be wired to run at 0.75 ohms, but I think you'd be better off running it at 3 ohms.
I would do the AQ 1200d wired down to .75. With box rise and stuff you should be around 800-1200 watts. Yes the aq will take a .75 ohm load with a good electrical to back it up. Also those alpine pdx ams do 1000watts from 1-4 ohms like the JL amps. There are a few others as well, but for budget, the AQ is the best bet imo.
i would look at the jbl gto14001. harmon audio sells them on ebay and i see them go for 160 sometimes 1200 rms at 4 ohms 1500 at 2 so maybe 1300 or so at 3 ohms?? but has a max current draw of 140 amps at 2 ohms..
I had the same problem finding an amp for my TC 4000 (single 3ohm) I needed 800-1500wrms at 3ohms. I finally got tired of looking and didnt want to pay out the a*s so I just got this http://www.sonicelectronix.com/item_7708_JBL+BPX500.1.html
I would guess Im getting around 700wrms at 3ohms but Im not sure. It powers my sub great tho. And I only paid like $120 for it
Kevin H. who still gets on here from time to time has an RD 1000.1 v2 for sale, i think he was wanting $250 shipped and it's still brand new in box. They are said to do 1300+ watts @ 1 ohm, and will do even more @ 0.75 ohm.