If you want to turn bowls, and they blank is out of round, 600 is WAY too fast IMHO, especially for a begining turner.
Do you have a bandsaw?
I ask becaue one thing you CAN do it to make sure that the blanks are as round as possible, and flat too, with a bandsaw you can go a long ways towards this.
May I ask why the rush?
You really don't want to get stuck with a lathe you don't like and only have to sell it at a loss later to get the lathe you should have bought the first time.
Look around some more, I hear good things about the Rikon Maxi lathe.....?
The pessimist complains about the wind; the optimist expects it to change; the realist adjusts the sails.
William Arthur Ward