I would stay with the tools you have now until you wear them down. You will probably find that half will get very little use; replace with better as your sharpening skills improve. I just can't see buying another "set" even at an improved quality.
Both of the gouges Bill referenced are very good. Starting out you may also look at Hurricane for individual bowl gouges.
Knowing what causes problems is a big step in correcting them. Here are links to videos by Richard Raffan and Brenden Stemp on problems with the skew.
https://www.youtube.com/watch?v=jOvF5f1phhY
https://www.youtube.com/watch?v=gMIwqFDMIhA