Setting up wireless digital music server


I am interested in putting much of my music collections to digital and control with an iPad. I have an inwall speaker system (and HT and 2 channels). The inwall speaker system would be the main target, but I also would like to access to the digital music library from other systems (plus on my laptop via wireless). Currently I use an integrated tube amp to connect to the inwall speakers.
I have mp3 files stored on a wireless hard disk. I don't have an iPad yet, but I will buy one and try to convert those mp3 files to iTunes library, and use the iPad screen to browse and select music. But I am not sure what other options are available for the rest. I might need to replace the int tube amp to a digital receiver that can connect to the wireless music server?
Any suggestion?
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"The spec says iPhone, iPod, and iPhone can work as a remote control."

BEing able to use a remote controller like this or even just a PC browser is a key feature for me. That provides the most remote control flexibility and also the most flexibility for displaying album art and other types of related content that might be available on the internet.

A trend will be for devices to get better at making it easy to navigate to internet content to look at while listening. This will hopefully move things forward again in terms of overall experience with recordings that took a big step back when tiny CDs replaced larger lps and the extensive album art and other content that used to often be included.