Kray,
John is right! Build a high quality 2-channel system first. Then, add an HT receiver or processor to the 2-channel system. If the pre-amp (or integrated amp for that matter) has an HT bypass/Processor loop, so much the better, but it is not necessary. You could just connect the front L&R pre-outs from any quality HT receiver/processor into any unused inputs of your 2-channel preamp. The bypass/loop will make it more convenient as you don't have to set the volume to a pre-defined level, but either way, if 2-channel music is you priority, build a 2-channel system that meets your music needs, then simply add HT capabilities later by adding a quality HT receiver to process your digital signal and power your center and surrounds and provide bass management.
If you would like more info, let me know. I've used a similar setup in numerous systems and it works well.
Enjoy,
TIC