Here are some option on ARC stuff, they all cover you freq spectrum:
ARC 2150SE- 345x2 1ohm/311x2 2 ohm
ARC 2075SE- 149x2 1ohm
ARC 2300SE- 649x2 2 ohm
ARC 4200SE- 205x4 2 ohm/200x4 1 ohm
ARC 2500XXK- 525x2 2ohm
ARC FD4150- 160x4 2ohm
ARC KAR600.4- 150x4 2 ohm
Zapco-
DC1000.4 250x4 2ohm
DC750.2 360x2 2ohm
C2k6.0x 300x2 2 ohm
C2k4.0x 150x4 2 ohm
Ref 750.2 375x2 2ohm
Ref 1000.4 250x4 2ohm
Sinfoni-
100.2SPX 370x2 1ohm
50.2SPX 220x2 1ohm
USamps-
AX600 300x2 2ohm
Audison-
SRx2S 300x2 2 ohm
LRx 2.500 330x2 2 ohm
VRx 2.150 240x2 1ohm
VRz 2.250 420x2 1ohm
VRx 2.400 580x2 1ohm
So after a little research because I had some free time looks like there are some just depends on how much cash you want to spend.
You could go with the PDX like chucku stated, they have nothing that goes 1ohm but they got 2ohm.
The JL 450/4 is super nice. There is a 450/4 and 500/1 the black ones to for sale still under warranty in the classifieds if they are still there. The guy selling them is a stand up guy on many forums to. I would check out some of the old PPI Art series stuff and see if any of those fit to, I know you want new.