Here is a huge list for you take a look at. Some are in your price range some are not and they are all 1ohm stable range from 1500-2500w. I am not saying all of them are great its just a list that's it. I did not list the ones that where listed earlier in this thread. I had some free time so here is the list I came up with.
Cadence ZRS8000D
JBL BPX2200.1
Hifonics XX-Colossus II
Diamond D61500.1
Memphis 16-MCD2500
MTX TA81001
Orion HCCAD5000
SoundStream PCA2000D
US AMPS XT4000D, MD-2D, MD-3D
MMats D2100.1, D3500.1, D2000.1, D3000.1
Autotek MM2000.1D
Crunch GP1500D, GP2500D, PZI1600.1