Need some help with box ideas and other things.

Well i finally stepped into the dark side i got a set of 15" ascendant atlas subs NIB on ebay. Im having a tough time finding t/s specs to enter into winisd to get an idea of what size to design. I know the subs are 300rms and i know thats mechanically, ive heard of more power going to them though. Im looking at cadence TXA-3002

heres the specs

4 ohm RMS Power: 2 x 150 Watts
2 ohm RMS Power: 2 x 300 Watts
4 Ohm Mono RMS Power: 1 x 600 Watts
Frequency Response: 20Hz - 30KHz
S/N Ratio: >100 db
Damping Factor: >200 @ 100Hz
Minimum THD: <0.05%
Channel Separation: 65db
Fully Adustable Crossover
Seperate Bass and Treble Equalization
Lucite Encapulated Terminals
Dimensions: 17" x 8.5" x 2.12"

the 2-ohm 300 is what im aiming for.

and then a 4 channel for my mb quart rears and my re-audio 6.5" comps.

im mainly looking at like 3.5 cuft each ported to between 28-35 hz just looking for some ideas on what to run.

Cmon i know somone on this site has experience with these, im also going for an SQL setup.