Just get an Advanced trainer and do 2 position training. It's easy to be competitive in Division V, so you can try to do so even without spending money on the transfer list. Looking at your team, you should probably try to buy 3 or 4 cheap 18 year old players to use as your trainees. Your current roster doesn't look like it has any good trainees, except maybe your 19 year old.
Anyway, personally I think spending 10K on scouting is optimal. The draft is somewhat random and with 10K you should be able to identify a couple of good draft picks. Plus, in Division V, there will be several Bot teams that will do worse than you and have better draft positions, plus the new owners will get extra information for the draft.
As for your decent pg prospect, he's 19 already and I seriously doubt that he will sell for the $1M you're asking. He's honestly probably only worth between $50K and $200K. So, you'll have him back and you might as well keep him and rotate him into your training. Then you can sell him after the season.