IMHO I'd wait a few months just to see what happens.
Chances are by then that the scene will have more knowledge on this newer version of sd2 and how it's managed to reduce the numbers of burners capable of 1:1 copies.
I almost bought a PLex 24x last year, and now I'm kinda glad I didn't.
The choice is then whether to buy a cheapie which will do almost everything well, Or wait a few months and see what happens.
In the meantime, do what I do. Copy games to an image file on your HD, and play them using Daemon tools. Keep the images and when you get a burner worth having, burn cdrs like they're going out of fashion.
Just my HO, though
