iTunes files are DRM-free AAC files that should be playable in all android music players without conversion; no need to run it through an app like Sound Taxi.
That wasn't true until late 2009 when iTunes Plus came about and they initially tried to charge more money for DRM Free songs. Those DRM free songs will appear as .M4A format when downloaded. They even demanded customers pay an upgrade for previously purchased songs to have the new version re-downloaded. No way...just Sound Taxi them and in minutes you'll be free. Besides, it's not just Apple that has/had various types of DRM. Amazon Instant Video, Zune Marketplace, BBC iPlayer, etc. all try and limit your use. Don't pay anyone to strip out DRM of older previously paid for music.
However, even with iTunes 11.x there are still songs that are downloaded as M4P files that continue to be protected by their FairPlay Digital Rights Management (DRM). It limits limits the number of computers that the file can be played on to (5) five.
Either way, there's no need to pay all that money to iTunes when there are other great sites available such as ivave or mp3million, mp3panda, etc.. Great quality and DRM Free, not to mention far less money.