What music format should I choose for a download?

I am new to downloading music and haven't used iTunes. I bought a track at theclassicalshop.net and it is now asking what format I want to download it in: WMA, WAV, AIF. I don't have a clue which one. Then in another part of the screen I have a choice between WMA  and MP3.
I have an iMac, iPhone and iPad; no W******.
I would also like some background information on formats. I gather from other questions in the forum that iTunes uses AAC or something but that it is lossy, which doesn't sound good. But I also gather that iTunes can convert from and to other formats. Is there some reliable information on this subject somewheter someone could point me to? I would really appreciate it. I can't find anything on apple.com.

MP3 and AAC (M4a) are both lossy. WAV and AIFF files are non-lossy but are very much larger - impracticably so for most downloading purposes. iTunes does not handle WMA files.
MP3 and AAC quality can be perfectly reasonable as long as they are not compressed too much - purchased items are usually fine. You could download AIFF if you want to be fussy, though it's likely the difference won't be obvious unless you are using a good hifi system.
You could download as AIFF or WAV and convert to MP3 or AAc but there's no point at all in doing that if you can download an MP3 version. Note that if you download an MP3 version there is no point in converting to AIFF - all you will do is make the file size larger, it won't improve the quality at all.
AAC files are slightly better quality than MP3 at the equivalent bitrate, though again the difference is minimal and not likely to be obvious in most playback situations. You could compromise by downloading AIFF and converting to AAC if you want to keep the filesize on your Mac (and more to the point your iPod) down, though the download will be a long one as a result. This post explains how to do the conversion:
https://discussions.apple.com/message/18167954#18167954

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