What Steve (Audioengr) suggests is certainly a valid route. Then he also manufactures the product he's recommending. Just be aware of that.
Another option that would be very simple too is getting a laptop to be used for music only, and a DAC with asynchronous USB input. You would have a USB cable between laptop and DAC, and analog IC between DAC and pre, and that's it. The laptop does not need to be powerful. You could use iTunes since you are familiar with it. Then, choose a DAC within your budget, and with the output connectors that match your pre.
Later, if you feel like it, you can get an iPad or iPod to use as a remote. You would probably love this!
This should be rather simple to implement and not expensive, and will get your toe in the water.
My two cents.
Another option that would be very simple too is getting a laptop to be used for music only, and a DAC with asynchronous USB input. You would have a USB cable between laptop and DAC, and analog IC between DAC and pre, and that's it. The laptop does not need to be powerful. You could use iTunes since you are familiar with it. Then, choose a DAC within your budget, and with the output connectors that match your pre.
Later, if you feel like it, you can get an iPad or iPod to use as a remote. You would probably love this!
This should be rather simple to implement and not expensive, and will get your toe in the water.
My two cents.