Question about subs under the seat? In a extended cab. 08 gmc Sierra

So I am going to start building my system for my 08 gmc Sierra extended cab
So for my subs my local car stereo guy told me to our some powerbass xl 10" subs.. He says those are a good bang for your buck.. I was maybe thinking some hdc3 10 or sundown sa 10
They will be powered by an alpine pdx 1.1000 under
And they will be going in a custom box under seat
Or what other subs do u guys think?

im running a single Treo ssp 10 in my dodge in a downfiring center console enclosure, and it gets pretty loud!

I concur with HUSKER....of course I helped with his banging 10"....LMAO

im gonna do 2 sa 8's in my 97

For overall performance a down firing enclosure is very nice and using up the area under the seat can work out very very well if done correctly. However, you have a limited height unless you raise the seat up and that will create issues with what you can use.

However, you are not limited to down firing in those trucks. You can do sub forward port forward, or sub forward port to the side, or a few other options.

While a center console enclosure works very well, I don't feel it is the correct answer for most installs. It just works and many times is quicker/easier then other options. Not to say it is a bad choice, it is just not my first choice.

Yeah.thats what I was thinking
Originally I wanted to put my type x under the set but too much of a head ache

Blow-through solves this dilemma.

That might just be my next option

With only 1k rms I would shy away from hdc's as you will barely get them moving. I'm a big fan of 8's so I would do a 4th order for 2 SA's .8 sealed 2 ported around 48. Should get loud and have a great bandwidth while using the power you have quite well.

That sounds pretty good.
Just need some one to build me a box.. My local charges me $350 + for a box