Before you go any further, I want you to be aware of a few things..
- 10% THD is TERRIBLE!!!!! THD = Total harmonic distortion! Speakers in cars are rated 0.01 -> 0.1% THD.. 10% is really really bad!
- You need to make sure the amp and speakers are the same resistance. Car speakers are mostly 4 ohm, home speakers are 8 ohm. You can't mix and match.
- I assume those are shielded speakers.. make sure!!
- Is volume control adjusted on the amp? If so, it's going to be a pain getting to it every time you want to change the volume. I assume you want to mount the amp inside the cab.
For the cost of your power supply, amp and speakers, you'd be better off to purchase a decent 2.1 computer setup setup (anything creative labs makes or logitec) you'll get better sound (lower THD) and won't worry about power. As a bonus, you'll get a volume control box that is mountable on the outside of the cab that will probably allow you to plug in headphones (for those late night gamings).
If you are not planning on running MAME/PC in your cab.. most PCB's have an audio amp on board, so you'll need to just plug the speakers straight to that.
Hope this helps.