hello eveybody

I'm in need for a new cab...I currently have a hartke lh1000 head which is and i'm looking for a cab to go with it.
I need a loud cab with a lot of lows as i'm in a very heavy band

I need something that can handle drop b tuning on my 4 string bass...and I don't want anything smaller than a 410 and just to be safe i want something over 600watts because thats what the lh1000 manual says...
I dont want to spend over $1500 AUD on a cab (cheaper then that would be great!haha)
Here are the cabs i have been looking at and some of their specs...
All these prices are Australian...
Ampeg Portaflex-410hlf - 800watts - 8ohms $800
Ampeg Svt - 610hlf -600watts - 4ohms $1500
Hartke Hydrive - 410 - 1000watts - 8ohms $950
Hartke Hydrive - 810 - 2000watts - 4ohms $1650 (I understnd that its over $1500 but its a good price for how loud it is)
Which cab do u suggest...whats the best for the price?
If you have anymore cab suggestions please say below
here are my bass head specs
Dual Parallel Mode: 2 x 225 watts @ 8 ohms, 2 x 320 watts @ 4 ohms, 2 x 545 watts @ 2 ohms
Bridge Mode: 1 x 750 watts @ 8 ohms, 1 x 1100 watts @ 4 ohms
Classic 12AX7 High Voltage Class-A tube preamp circuit
Bass and Treble Shelving, plus mid-peak EQ controls
Selectable brite switch for added high frequency response
Selectable limiter switch with LED indicator
Balance control blends level of A and B outputs
Front panel XLR balanced direct output
Rear panel 1/4-inch effects loop
1/4-inch plus Speakon™ output connectors
Two-rackspace metal chassis with steel faceplate and handles