The scouting budget has no bearing on the signing probabilities, as far as I'm aware. It only affects the rating projections. If you go for the Probably won't Sign guys to wait for the comp picks, make sure that their mother is listed as their consultant. But also be aware that they often ask for much more money, so you have to make sure you have enough to make them an offer. You don't have to offer to all of them at the same time, so offer to 1 or 2, wait for them to formally decline (the big red X), then offer to the others.