if I was in your shoe's I would go with the single 10 and run power to it...It will weigh less and probably sound very similar to what the 2 10's would sound like...

 

When I did My system I wasnt really taking weight into consideration (I did 3 audiobahn 12's) but..If i were to ever re-do my system to a more practical system, I would probably do the 1 10 or 1 12...I prefer to run systems in odd numbers because its either a 'clean bass' or its 'make car alarms go off and have neighbors complaining' in my opinion there is no middle ground for me...
-Zoeb

 

another fan of the single sub.
go with a better ten and you will be happier. if you want more bass, go with a single 12. anything more than that is just show (or competition if you are in to that)

the he2 is a dual voice coil right?

 

I would go with the single 10 rather than the Dual 10 set up. I am guessing at the specs on the speakers but from the general numbers you have provided I would go with a higher power single speaker system. Things like excursion or Xmax values as well as power handling go a long way toward a harder hitting system. Don't over look the fact that you should have a well designed box to go with the speakers. Power and Size are nothing without control, and thats where the box comes into play.

I just got my WRX and I haven't decided what to get yet. I was leaning toward a dual 8 setup for some really tight bass. My Integra GS-R currently has 3 JL Audio 10w6's running a total of 1000w. It is very tight and could be considered a groundpounder. I have heard other with nearly the same set up but they sounded like crap. It usually came down to a box that was the wrong size or design. Check the manufactures suggestions of box volumes as well as type. A sealed box lends itself to well controlled low frequency response vs. having something like a ported or bandpass design for a higher SPL (~volume/loudness) rating.

hopefully that was helpful, good luck and have fun with your new sound system.

peace.