02 double cab Sub/amp suggestions

[jnub]

Hello all,

I've posted here a few times so call me new. My girlfriend is getting me subs for my birthday, and I was wondering what else would fit besides the Pioneer Premier 8" fits behind the seats? I know the space behind the back seat is a little tight, but MrMarv said he can build a custom enclosure where the amp sits in between the two subs. So my question is, what amp/sub combo do you guys suggest for me to put in? I am just a little iffy on the spacing, which is why I am asking help. Not sure what amp I can fit.