MPG to AAC - better to import again or ok to convert?

While I don't remember changing my iTunes Preferences to rip all my CDs as MPGs, I must have done it, because all my song files are MPG. I want to have them as AAC to save space and for better sound quality.
My question is would it be better to re-import from the CDs for better quality or is it the same if I just convert the MPGs to AAC files?
Is it true that the sound quality of AAC is noticably better?
Looking for wisdom. Thanks so much.

I don't know how much of a concern storage space is to you, but if you encode MP3s with LAME, you'll achieve the best quality vis-à-vis file size with the "transparent" setting (~190kbps). If you listen to your music on an iPod or other portable player, then the "portable" setting (~130kbps) may be sufficient for you.
To rip CDs and directly encode files to MP3 format using LAME, I would recommend using Max. The most recent "recommended" version of LAME is included in the software, and if you need any help configuring Max for CD ripping and encoding, I'm sure I can help with that too.
What is LAME and how can it help if I made poor quality MP3s in the first place using iTunes?
See here for the best information on the Internet regarding LAME. Although you would still need to rip your CDs again in order to attain better results than you did before, LAME can help by yielding better sounding files.
Note: Your profile information doesn't reveal which operating system you're using, so keep in mind that Max requires OS X v. 10.4.x Tiger.

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