Fred Holder has a book called Woodholding On The Lathe (title might be worded wrong?). Might be worthwhile buying that First, then see what you want to do. I know you can find it at Amazon - if your ISP is working, which mine is not at the moment - and I'm pretty sure Fred sells it from his site also.
It's possible, but it's also possible that you get a piece of junk, have problems with it and not know if it is your technique or the chuck which is responsible. A good rule of thumb is 'You need better tools as a novice than you do as an expert.' - not necessarily more expensive, but good solid quality. The exception being cheap chisels for practicing grinding.
I think you could easily sell a used Supernova. A used Thingamee is a doorstop. If you get to a point where you Need independent jaws, you'll probably have enough experience that you can get away with a less expensive chuck with independent jaws and you'll want to keep the scroll chuck anyway.
Again, try Fred's book before you buy. Here's Fred's site:
LD