I'd wait a bit on MJ 8 Beta. Its got some issues, and some of the features, old and new are kind of wonky.
Its only been in beta for about 8 weeks.
Play around with 7.x until your familiar with it. That will also give you a benchmark for when you go to 8. You can see if anything is faster/slower, better/worse.
I had 8 installed only very briefly, cause it seemed to rip CD's a lot slower than 7. Could've been my imagination tho.
Also I'd rather rip my CD's on an official tested release than a beta.
Another .02 cents USD.

Z~